diff --git a/scad/arri_s_mount.scad b/scad/arri_s_mount.scad
index c5cd5aa..b5b1db5 100644
--- a/scad/arri_s_mount.scad
+++ b/scad/arri_s_mount.scad
@@ -41,18 +41,45 @@ module camera_bolt (width = 20) {
     cube([width, camBoltD, Z + 1], center = true);
 }
 
+module wing_nuts (nutZ = 0) {
+    translate([mountBoltsX/2, mountBoltsY/2, nutZ]) rotate([0, 0, 5]) cube([3.5, 22, 11], center = true);
+    translate([-mountBoltsX/2, mountBoltsY/2, nutZ]) rotate([0, 0, 5]) cube([3.5, 22, 11], center = true);
+    translate([mountBoltsX/2, -mountBoltsY/2, nutZ]) rotate([0, 0, 5]) cube([3.5, 22, 11], center = true);
+    translate([-mountBoltsX/2, -mountBoltsY/2, nutZ]) rotate([0, 0, 5]) cube([3.5, 22, 11], center = true);
+}
+
 module mount () {
     difference () {
         rounded_cube([mountBoltsX + 20, baseY, Z], d = 20, center =true, $fn = 60);
         //center void
         translate([0, 0, -camBoltZ]) cube([mountBoltsX - 20, innerBaseY, Z], center =true);
+        //side void
         translate([0, 0, -camBoltZ]) cube([baseX + 1, innerBaseY - 40, Z], center =true);
         bolts(boltD + .4, Z + 1);
         //inset
         translate([0, 0, (Z / 2) - (Z / 2) + 15]) bolts(20, Z);
         camera_bolt();
+        wing_nuts(-(Z / 2) + 20.5);
+    }
+}
+
+module center_fitting () {
+    SMALL_D = 4.5;
+    SMALL_Z = 9;
+    LARGE_D = 9.4;
+    translate([10.7, 0, 0]) cylinder(r = R(SMALL_D), h = SMALL_Z, center = true, $fn = 40);
+    difference () {
+        //cube
+        translate([(SMALL_D/2) + (LARGE_D / 2), 0, -(SMALL_Z/2)-(camBoltZ/2)]) cube([camBoltD + SMALL_D, camBoltD - 0.3, camBoltZ], center = true);
+        cylinder(r = R(LARGE_D), h = 60, center = true, $fn = 60);
+        translate([10.7 - 1, 0, 0]) difference () {
+            translate([(camBoltD + 1) / 2, 0, 0]) cube([camBoltD + 1, camBoltD + 1, 60], center = true);
+            cylinder(r = R(camBoltD), h = 60, center = true, $fn = 60);
+        }
     }
 }
 
 //base();
-translate([0, 0, (baseZ/2) + (Z/2) + 5]) mount();
\ No newline at end of file
+//translate([0, 0, (baseZ/2) + (Z/2) + 5]) mount();
+//translate([0, 0, (baseZ/2) + Z + 9]) 
+center_fitting();
\ No newline at end of file
diff --git a/scad/jk_lens_assembly.scad b/scad/jk_lens_assembly.scad
index 151b7f3..471fe4e 100644
--- a/scad/jk_lens_assembly.scad
+++ b/scad/jk_lens_assembly.scad
@@ -72,26 +72,35 @@ module lensAssemblyBellowsBoard () {
         }
 		rotate([-90, 0, 0]) {
 			translate([-(XWidth/2) + 2.5, -FrontOffset, -XOffset]) rotate([0, 90, 0]) TNut();
-            //m3
-            translate([-(XWidth/2) + 2.5 + 5, -FrontOffset - 8, -XOffset]) rotate([0, -90, 0]) rotate([0, 0, 90]) m3BoltNut();
+            //m3s
+            //   -centered
+            translate([-(XWidth/2) + 2.5 + 5, -FrontOffset - 8, -XOffset]) rotate([0, -90, 0])  rotate([0, 0, 90]) m3BoltNut();
+            //   -top no nut
+            translate([-(XWidth/2) + 2.5 + 5, -FrontOffset, -XOffset + 8]) rotate([0, -90, 0]) cylinder(r = 3.1 / 2, h = 20, center = true, $fn = 40);
+            //   -bottom no nut
+            translate([-(XWidth/2) + 2.5 + 5, -FrontOffset, -XOffset - 8]) rotate([0, -90, 0])  cylinder(r = 3.1 / 2, h = 20, center = true, $fn = 40);
 			translate([(XWidth/2) - 2.5, -FrontOffset, -XOffset]) rotate([0, -90, 0]) TNut();
-            //m3
+            //m3s
+            //    -center
             translate([(XWidth/2) - 2.5 - 5, -FrontOffset - 8, -XOffset]) rotate([0, 90, 0]) rotate([0, 0, 90]) m3BoltNut();
+            //    -top no nut
+            translate([(XWidth/2) - 2.5 - 5, -FrontOffset, -XOffset + 8]) rotate([0, 90, 0]) cylinder(r = 3.1 / 2, h = 20, center = true, $fn = 40);
+            //    -bottom no nut
+            translate([(XWidth/2) - 2.5 - 5, -FrontOffset, -XOffset - 8]) rotate([0, 90, 0]) cylinder(r = 3.1 / 2, h = 20, center = true, $fn = 40);
 		}
 		rotate([-90, 0, 0]) translate([0, -FrontOffset, -XOffset]) rotate([0, 90, 0]) threadedRod(RodLength, 0.5);
        translate([0, -XOffset, -10.5]) cube([100,30, 15], center = true); 
 	}
+
 	//top
 	difference () {
 		translate([0, XOffset, FrontOffset]) rotate([0, 90, 0]) cylinder(r = R(25), h = 24, center = true, $fn = 80);
 		rotate([-90, 0, 0]) {
 			translate([0, -FrontOffset, XOffset]) rotate([0, 90, 0]) linearBearing(0.25);
 		}
-		//translate([0, XOffset + 10, 0]) cube([24 + 1, 10, 3], center = true);
         translate([0, XOffset, -10.5]) cube([24 + 1,30, 15], center = true);
 		rotate([-90, 0, 0]) translate([0, -FrontOffset, XOffset]) rotate([0, 90, 0]) linearMotionRod(RodLength);	
 	}
-    
 }
 
 module lensAssemblyThreadedZ () {
@@ -169,35 +178,39 @@ module lensAssemblyLinearZ () {
 	}
 }
 
-//rotate([90, 0, 0]) lensAssemblyBellowsBoard();
+module debug () {
+    rotate([90, 0, 0]) lensAssemblyBellowsBoard();
 
-//translate([-ZOffset, BackOffset, 0]) lensAssemblyThreadedZ();
-//translate([ZOffset, BackOffset, 5]) lensAssemblyLinearZ();
+    translate([-ZOffset, BackOffset, 0]) lensAssemblyThreadedZ();
+    translate([ZOffset, BackOffset, 5]) lensAssemblyLinearZ();
 
-//Z axis
-//translate([-ZOffset, BackOffset, 0])  threadedRod(RodLength);
-//translate([ZOffset, BackOffset, 0]) linearMotionRod(RodLength);
+    //Z axis
+    //translate([-ZOffset, BackOffset, 0])  threadedRod(RodLength);
+    //translate([ZOffset, BackOffset, 0]) linearMotionRod(RodLength);
 
-//translate([40, 8, 0]) linearBearing();
-//translate([-40, 8, 25]) rotate([180, 0, 0]) TNut();
-//translate([-40, 8, -25]) TNut();
+    //translate([40, 8, 0]) linearBearing();
+    //translate([-40, 8, 25]) rotate([180, 0, 0]) TNut();
+    //translate([-40, 8, -25]) TNut();
 
-//translate([ZOffset, 5, 15]) color("blue") m4_nut();
-//translate([ZOffset, 5, -15]) color("blue") m4_nut();
+    //translate([ZOffset, 5, 15]) color("blue") m4_nut();
+    //translate([ZOffset, 5, -15]) color("blue") m4_nut();
 
-//X axis
-//translate([0, -FrontOffset, -XOffset]) rotate([0, 90, 0]) threadedRod(RodLength);
-//translate([0, -FrontOffset, XOffset]) rotate([0, 90, 0])  linearMotionRod(RodLength);
+    //X axis
+    //translate([0, -FrontOffset, -XOffset]) rotate([0, 90, 0]) threadedRod(RodLength);
+    //translate([0, -FrontOffset, XOffset]) rotate([0, 90, 0])  linearMotionRod(RodLength);
 
-//translate([0, -8, 40]) rotate([0, 90, 0]) linearBearing();
-//translate([-25, -8, -XOffset]) rotate([0, 90, 0]) TNut();
-//translate([25, -8, -XOffset]) rotate([0, -90, 0]) TNut();
+    //translate([0, -8, 40]) rotate([0, 90, 0]) linearBearing();
+    //translate([-25, -8, -XOffset]) rotate([0, 90, 0]) TNut();
+    //translate([25, -8, -XOffset]) rotate([0, -90, 0]) TNut();
 
-//translate([-15, -5, XOffset]) rotate([0, 90, 0]) color("blue") m4_nut();
-//translate([15, -5, XOffset]) rotate([0, 90, 0]) color("blue") m4_nut();
+    //translate([-15, -5, XOffset]) rotate([0, 90, 0]) color("blue") m4_nut();
+    //translate([15, -5, XOffset]) rotate([0, 90, 0]) color("blue") m4_nut();
+}
 
 PART = "lens_assembly_bellows_board";
 
 if (PART == "lens_assembly_bellows_board") {
     lensAssemblyBellowsBoard();
+} else {
+    debug();
 }
diff --git a/stl/arri_s_camera_bellows_board.stl b/stl/arri_s_camera_bellows_board.stl
index c65d66d..e9c6566 100644
Binary files a/stl/arri_s_camera_bellows_board.stl and b/stl/arri_s_camera_bellows_board.stl differ
diff --git a/stl/arri_s_mount.stl b/stl/arri_s_mount.stl
index 31d44a7..a7948d8 100644
Binary files a/stl/arri_s_mount.stl and b/stl/arri_s_mount.stl differ
diff --git a/stl/arri_s_mount_center_fitting.stl b/stl/arri_s_mount_center_fitting.stl
new file mode 100644
index 0000000..0bd7729
Binary files /dev/null and b/stl/arri_s_mount_center_fitting.stl differ
diff --git a/stl/camera_bellows_board.stl b/stl/camera_bellows_board.stl
new file mode 100644
index 0000000..6e8e1f9
Binary files /dev/null and b/stl/camera_bellows_board.stl differ
diff --git a/stl/jk_lens_assembly_bellows_board.stl b/stl/jk_lens_assembly_bellows_board.stl
new file mode 100644
index 0000000..2b7fc6c
Binary files /dev/null and b/stl/jk_lens_assembly_bellows_board.stl differ