diff --git a/scad/bellows.scad b/scad/bellows.scad
index d5d6247..49bb3ad 100644
--- a/scad/bellows.scad
+++ b/scad/bellows.scad
@@ -51,7 +51,7 @@ module bellows_camera_board (magnets = false) {
 
 module bellows_lens_board (magnets = false) {
     H = 3;
-    ProtrusionD = 39.25;
+    ProtrusionD = 38.25;
     ProtrusionH = 5;
     InnerD = 34.5;
     difference () {
diff --git a/stl/bellows_lens_board.stl b/stl/bellows_lens_board.stl
index 28d92c9..0177c1e 100644
--- a/stl/bellows_lens_board.stl
+++ b/stl/bellows_lens_board.stl
@@ -16,7 +16,7 @@ solid OpenSCAD_Model
   facet normal 0 0 1
     outer loop
       vertex -0.301054 -17.2474 6.5
-      vertex 0 -19.625 6.5
+      vertex 0 -19.125 6.5
       vertex 0 -17.25 6.5
     endloop
   endfacet
@@ -38,49 +38,49 @@ solid OpenSCAD_Model
     outer loop
       vertex -0.301054 17.2474 6.5
       vertex 0 17.25 6.5
-      vertex 0 19.625 6.5
+      vertex 0 19.125 6.5
     endloop
   endfacet
-  facet normal -0.00875871 -0.999962 0
+  facet normal -0.00868813 -0.999962 0
     outer loop
-      vertex -0.342503 -19.622 1.5
-      vertex 0 -19.625 1.5
-      vertex 0 -19.625 6.5
+      vertex -0.333776 -19.1221 1.5
+      vertex 0 -19.125 1.5
+      vertex 0 -19.125 6.5
     endloop
   endfacet
-  facet normal -0.00875871 -0.999962 0
+  facet normal -0.00868813 -0.999962 0
     outer loop
-      vertex -0.342503 -19.622 1.5
-      vertex 0 -19.625 6.5
-      vertex -0.342503 -19.622 6.5
+      vertex -0.333776 -19.1221 1.5
+      vertex 0 -19.125 6.5
+      vertex -0.333776 -19.1221 6.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -0.342503 -19.622 6.5
-      vertex 0 -19.625 6.5
+      vertex -0.333776 -19.1221 6.5
+      vertex 0 -19.125 6.5
       vertex -0.301054 -17.2474 6.5
     endloop
   endfacet
-  facet normal -0.00875871 0.999962 0
+  facet normal -0.00868813 0.999962 0
     outer loop
-      vertex -0.342503 19.622 1.5
-      vertex -0.342503 19.622 6.5
-      vertex 0 19.625 1.5
+      vertex -0.333776 19.1221 1.5
+      vertex -0.333776 19.1221 6.5
+      vertex 0 19.125 1.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -0.342503 19.622 6.5
+      vertex -0.333776 19.1221 6.5
       vertex -0.301054 17.2474 6.5
-      vertex 0 19.625 6.5
+      vertex 0 19.125 6.5
     endloop
   endfacet
-  facet normal -0.00875871 0.999962 0
+  facet normal -0.00868813 0.999962 0
     outer loop
-      vertex -0.342503 19.622 6.5
-      vertex 0 19.625 6.5
-      vertex 0 19.625 1.5
+      vertex -0.333776 19.1221 6.5
+      vertex 0 19.125 6.5
+      vertex 0 19.125 1.5
     endloop
   endfacet
   facet normal 0.0262402 0.999656 0
@@ -100,7 +100,7 @@ solid OpenSCAD_Model
   facet normal 0 0 1
     outer loop
       vertex -0.602015 -17.2395 6.5
-      vertex -0.342503 -19.622 6.5
+      vertex -0.333776 -19.1221 6.5
       vertex -0.301054 -17.2474 6.5
     endloop
   endfacet
@@ -122,49 +122,49 @@ solid OpenSCAD_Model
     outer loop
       vertex -0.602015 17.2395 6.5
       vertex -0.301054 17.2474 6.5
-      vertex -0.342503 19.622 6.5
+      vertex -0.333776 19.1221 6.5
     endloop
   endfacet
-  facet normal -0.026276 -0.999655 0
+  facet normal -0.0263636 -0.999652 0
     outer loop
-      vertex -0.684902 -19.613 1.5
-      vertex -0.342503 -19.622 1.5
-      vertex -0.342503 -19.622 6.5
+      vertex -0.667453 -19.1133 1.5
+      vertex -0.333776 -19.1221 1.5
+      vertex -0.333776 -19.1221 6.5
     endloop
   endfacet
-  facet normal -0.026276 -0.999655 0
+  facet normal -0.0263636 -0.999652 0
     outer loop
-      vertex -0.684902 -19.613 1.5
-      vertex -0.342503 -19.622 6.5
-      vertex -0.684902 -19.613 6.5
+      vertex -0.667453 -19.1133 1.5
+      vertex -0.333776 -19.1221 6.5
+      vertex -0.667453 -19.1133 6.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -0.684902 -19.613 6.5
-      vertex -0.342503 -19.622 6.5
+      vertex -0.667453 -19.1133 6.5
+      vertex -0.333776 -19.1221 6.5
       vertex -0.602015 -17.2395 6.5
     endloop
   endfacet
-  facet normal -0.026276 0.999655 0
+  facet normal -0.0263636 0.999652 0
     outer loop
-      vertex -0.684902 19.613 1.5
-      vertex -0.684902 19.613 6.5
-      vertex -0.342503 19.622 1.5
+      vertex -0.667453 19.1133 1.5
+      vertex -0.667453 19.1133 6.5
+      vertex -0.333776 19.1221 1.5
     endloop
   endfacet
-  facet normal -0.026276 0.999655 0
+  facet normal -0.0263636 0.999652 0
     outer loop
-      vertex -0.684902 19.613 6.5
-      vertex -0.342503 19.622 6.5
-      vertex -0.342503 19.622 1.5
+      vertex -0.667453 19.1133 6.5
+      vertex -0.333776 19.1221 6.5
+      vertex -0.333776 19.1221 1.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -0.684902 19.613 6.5
+      vertex -0.667453 19.1133 6.5
       vertex -0.602015 17.2395 6.5
-      vertex -0.342503 19.622 6.5
+      vertex -0.333776 19.1221 6.5
     endloop
   endfacet
   facet normal 0.0435122 0.999053 0
@@ -184,7 +184,7 @@ solid OpenSCAD_Model
   facet normal 0 0 1
     outer loop
       vertex -0.902795 -17.2264 6.5
-      vertex -0.684902 -19.613 6.5
+      vertex -0.667453 -19.1133 6.5
       vertex -0.602015 -17.2395 6.5
     endloop
   endfacet
@@ -206,49 +206,49 @@ solid OpenSCAD_Model
     outer loop
       vertex -0.902795 17.2264 6.5
       vertex -0.602015 17.2395 6.5
-      vertex -0.684902 19.613 6.5
+      vertex -0.667453 19.1133 6.5
     endloop
   endfacet
-  facet normal -0.0435021 -0.999053 0
+  facet normal -0.0434402 -0.999056 0
     outer loop
-      vertex -1.02709 -19.5981 1.5
-      vertex -0.684902 -19.613 1.5
-      vertex -0.684902 -19.613 6.5
+      vertex -1.00093 -19.0988 1.5
+      vertex -0.667453 -19.1133 1.5
+      vertex -0.667453 -19.1133 6.5
     endloop
   endfacet
-  facet normal -0.0435021 -0.999053 0
+  facet normal -0.0434402 -0.999056 0
     outer loop
-      vertex -1.02709 -19.5981 1.5
-      vertex -0.684902 -19.613 6.5
-      vertex -1.02709 -19.5981 6.5
+      vertex -1.00093 -19.0988 1.5
+      vertex -0.667453 -19.1133 6.5
+      vertex -1.00093 -19.0988 6.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -1.02709 -19.5981 6.5
-      vertex -0.684902 -19.613 6.5
+      vertex -1.00093 -19.0988 6.5
+      vertex -0.667453 -19.1133 6.5
       vertex -0.902795 -17.2264 6.5
     endloop
   endfacet
-  facet normal -0.0435021 0.999053 0
+  facet normal -0.0434402 0.999056 0
     outer loop
-      vertex -1.02709 19.5981 1.5
-      vertex -1.02709 19.5981 6.5
-      vertex -0.684902 19.613 1.5
+      vertex -1.00093 19.0988 1.5
+      vertex -1.00093 19.0988 6.5
+      vertex -0.667453 19.1133 1.5
     endloop
   endfacet
-  facet normal -0.0435021 0.999053 0
+  facet normal -0.0434402 0.999056 0
     outer loop
-      vertex -1.02709 19.5981 6.5
-      vertex -0.684902 19.613 6.5
-      vertex -0.684902 19.613 1.5
+      vertex -1.00093 19.0988 6.5
+      vertex -0.667453 19.1133 6.5
+      vertex -0.667453 19.1133 1.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -1.02709 19.5981 6.5
+      vertex -1.00093 19.0988 6.5
       vertex -0.902795 17.2264 6.5
-      vertex -0.684902 19.613 6.5
+      vertex -0.667453 19.1133 6.5
     endloop
   endfacet
   facet normal 0.0611158 0.998131 0
@@ -268,7 +268,7 @@ solid OpenSCAD_Model
   facet normal 0 0 1
     outer loop
       vertex -1.2033 -17.208 6.5
-      vertex -1.02709 -19.5981 6.5
+      vertex -1.00093 -19.0988 6.5
       vertex -0.902795 -17.2264 6.5
     endloop
   endfacet
@@ -290,49 +290,49 @@ solid OpenSCAD_Model
     outer loop
       vertex -1.2033 17.208 6.5
       vertex -0.902795 17.2264 6.5
-      vertex -1.02709 19.5981 6.5
+      vertex -1.00093 19.0988 6.5
     endloop
   endfacet
-  facet normal -0.0610186 -0.998137 0
+  facet normal -0.0611174 -0.998131 0
     outer loop
-      vertex -1.36897 -19.5772 1.5
-      vertex -1.02709 -19.5981 1.5
-      vertex -1.02709 -19.5981 6.5
+      vertex -1.33409 -19.0784 1.5
+      vertex -1.00093 -19.0988 1.5
+      vertex -1.00093 -19.0988 6.5
     endloop
   endfacet
-  facet normal -0.0610186 -0.998137 0
+  facet normal -0.0611174 -0.998131 0
     outer loop
-      vertex -1.36897 -19.5772 1.5
-      vertex -1.02709 -19.5981 6.5
-      vertex -1.36897 -19.5772 6.5
+      vertex -1.33409 -19.0784 1.5
+      vertex -1.00093 -19.0988 6.5
+      vertex -1.33409 -19.0784 6.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -1.36897 -19.5772 6.5
-      vertex -1.02709 -19.5981 6.5
+      vertex -1.33409 -19.0784 6.5
+      vertex -1.00093 -19.0988 6.5
       vertex -1.2033 -17.208 6.5
     endloop
   endfacet
-  facet normal -0.0610186 0.998137 0
+  facet normal -0.0611174 0.998131 0
     outer loop
-      vertex -1.36897 19.5772 1.5
-      vertex -1.36897 19.5772 6.5
-      vertex -1.02709 19.5981 1.5
+      vertex -1.33409 19.0784 1.5
+      vertex -1.33409 19.0784 6.5
+      vertex -1.00093 19.0988 1.5
     endloop
   endfacet
-  facet normal -0.0610186 0.998137 0
+  facet normal -0.0611174 0.998131 0
     outer loop
-      vertex -1.36897 19.5772 6.5
-      vertex -1.02709 19.5981 6.5
-      vertex -1.02709 19.5981 1.5
+      vertex -1.33409 19.0784 6.5
+      vertex -1.00093 19.0988 6.5
+      vertex -1.00093 19.0988 1.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -1.36897 19.5772 6.5
+      vertex -1.33409 19.0784 6.5
       vertex -1.2033 17.208 6.5
-      vertex -1.02709 19.5981 6.5
+      vertex -1.00093 19.0988 6.5
     endloop
   endfacet
   facet normal 0.078388 0.996923 0
@@ -352,7 +352,7 @@ solid OpenSCAD_Model
   facet normal 0 0 1
     outer loop
       vertex -1.50344 -17.1844 6.5
-      vertex -1.36897 -19.5772 6.5
+      vertex -1.33409 -19.0784 6.5
       vertex -1.2033 -17.208 6.5
     endloop
   endfacet
@@ -374,49 +374,49 @@ solid OpenSCAD_Model
     outer loop
       vertex -1.50344 17.1844 6.5
       vertex -1.2033 17.208 6.5
-      vertex -1.36897 19.5772 6.5
+      vertex -1.33409 19.0784 6.5
     endloop
   endfacet
-  facet normal -0.078536 -0.996911 0
+  facet normal -0.0784925 -0.996915 0
     outer loop
-      vertex -1.71043 -19.5503 1.5
-      vertex -1.36897 -19.5772 1.5
-      vertex -1.36897 -19.5772 6.5
+      vertex -1.66685 -19.0522 1.5
+      vertex -1.33409 -19.0784 1.5
+      vertex -1.33409 -19.0784 6.5
     endloop
   endfacet
-  facet normal -0.078536 -0.996911 0
+  facet normal -0.0784925 -0.996915 0
     outer loop
-      vertex -1.71043 -19.5503 1.5
-      vertex -1.36897 -19.5772 6.5
-      vertex -1.71043 -19.5503 6.5
+      vertex -1.66685 -19.0522 1.5
+      vertex -1.33409 -19.0784 6.5
+      vertex -1.66685 -19.0522 6.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -1.71043 -19.5503 6.5
-      vertex -1.36897 -19.5772 6.5
+      vertex -1.66685 -19.0522 6.5
+      vertex -1.33409 -19.0784 6.5
       vertex -1.50344 -17.1844 6.5
     endloop
   endfacet
-  facet normal -0.078536 0.996911 0
+  facet normal -0.0784925 0.996915 0
     outer loop
-      vertex -1.71043 19.5503 1.5
-      vertex -1.71043 19.5503 6.5
-      vertex -1.36897 19.5772 1.5
+      vertex -1.66685 19.0522 1.5
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+      vertex -1.33409 19.0784 1.5
     endloop
   endfacet
-  facet normal -0.078536 0.996911 0
+  facet normal -0.0784925 0.996915 0
     outer loop
-      vertex -1.71043 19.5503 6.5
-      vertex -1.36897 19.5772 6.5
-      vertex -1.36897 19.5772 1.5
+      vertex -1.66685 19.0522 6.5
+      vertex -1.33409 19.0784 6.5
+      vertex -1.33409 19.0784 1.5
     endloop
   endfacet
   facet normal 0 0 1
     outer loop
-      vertex -1.71043 19.5503 6.5
+      vertex -1.66685 19.0522 6.5
       vertex -1.50344 17.1844 6.5
-      vertex -1.36897 19.5772 6.5
+      vertex -1.33409 19.0784 6.5
     endloop
   endfacet
   facet normal 0.0959909 0.995382 0
@@ -436,7 +436,7 @@ solid OpenSCAD_Model
   facet normal 0 0 1
     outer loop
       vertex -1.80312 -17.1555 6.5
-      vertex -1.71043 -19.5503 6.5
+      vertex -1.66685 -19.0522 6.5
       vertex -1.50344 -17.1844 6.5
     endloop
   endfacet
@@ -458,63 +458,105 @@ solid OpenSCAD_Model
     outer loop
       vertex -1.80312 17.1555 6.5
       vertex -1.50344 17.1844 6.5
-      vertex -1.71043 19.5503 6.5
+      vertex -1.66685 19.0522 6.5
     endloop
   endfacet
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+  facet normal -0.0958665 -0.995394 0
     outer loop
-      vertex -10.1076 -16.8219 1.5
-      vertex -9.8125 -16.9957 1.5
-      vertex -9.8125 -16.9957 6.5
+      vertex -1.99911 -19.0202 1.5
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     endloop
   endfacet
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+    endloop
+  endfacet
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+    outer loop
+      vertex -1.99911 19.0202 1.5
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+    endloop
+  endfacet
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+    outer loop
+      vertex -1.99911 19.0202 6.5
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+    endloop
+  endfacet
+  facet normal 0 0 1
+    outer loop
+      vertex -1.99911 19.0202 6.5
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+    outer loop
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+  endfacet
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+    outer loop
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+  endfacet
+  facet normal 0 0 1
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@@ -573,60 +615,60 @@ solid OpenSCAD_Model
       vertex -10.3813 13.7765 6.5
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@@ -14247,14 +14345,14 @@ solid OpenSCAD_Model
   facet normal 0 0 1
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   facet normal 0 0 1
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-      vertex 18.196 -7.35165 6.5
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@@ -14395,14 +14493,14 @@ solid OpenSCAD_Model
     outer loop
       vertex 16.1043 6.18185 6.5
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@@ -14577,14 +14675,56 @@ solid OpenSCAD_Model
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-      vertex 9.8125 16.9957 1.5
-      vertex 9.8125 16.9957 6.5
-      vertex 10.1076 16.8219 1.5
+      vertex 9.8501 16.3933 1.5
+      vertex 9.8501 16.3933 6.5
+      vertex 10.1347 16.2189 1.5
     endloop
   endfacet
-  facet normal 0.507479 0.861664 0
+  facet normal 0.522492 0.852644 0
     outer loop
-      vertex 9.8125 16.9957 6.5
-      vertex 10.1076 16.8219 6.5
-      vertex 10.1076 16.8219 1.5
+      vertex 9.8501 16.3933 6.5
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+      vertex 10.1347 16.2189 1.5
     endloop
   endfacet
   facet normal 0 0 -1
@@ -20337,14 +20337,14 @@ solid OpenSCAD_Model
   facet normal 0 0 1
     outer loop
       vertex 9.89419 -14.1304 6.5
-      vertex 10.9742 -16.2699 6.5
-      vertex 11.2564 -16.0759 6.5
+      vertex 10.6946 -15.8553 6.5
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     endloop
   endfacet
   facet normal 0 0 1
     outer loop
       vertex 9.89419 -14.1304 6.5
-      vertex 11.2564 -16.0759 6.5
+      vertex 10.9696 -15.6663 6.5
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     endloop
   endfacet
@@ -20373,14 +20373,14 @@ solid OpenSCAD_Model
     outer loop
       vertex 9.89419 14.1304 6.5
       vertex 10.1393 13.9555 6.5
-      vertex 11.2564 16.0759 6.5
+      vertex 10.9696 15.6663 6.5
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   facet normal 0 0 1
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       vertex 9.89419 14.1304 6.5
-      vertex 11.2564 16.0759 6.5
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+      vertex 10.9696 15.6663 6.5
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   endfacet
 endsolid OpenSCAD_Model