diff --git a/examples/JK_projector_takeup.scad b/examples/JK_projector_takeup.scad
index 35db56b..4164269 100644
--- a/examples/JK_projector_takeup.scad
+++ b/examples/JK_projector_takeup.scad
@@ -27,6 +27,11 @@ M5 = 5;
 
 FILTER_X = 55.4;
 FILTER_Y = 6.5;
+FILTER_VOID_X = FILTER_X - 9 + ((4.5 - 2.34) * 2);
+
+module m5_nut () {
+    cylinder(r = R(9.4), h = 4, center = true, $fn = 6);
+}
 
 module block () {
     cube([AX, AY, AZ], center = true);
@@ -36,8 +41,14 @@ module block () {
             translate([0, BY - 5.44, 0]) cube([53.2, BY, BZ + 1], center = true);
             //bolts
             translate([0, (BY / 2) - 3.5, 0]) {
-                translate([BOLTSX / 2, 0, 0]) cylinder(r = 4 / 2, h = BZ + 1, center = true, $fn = 50);
-                translate([-BOLTSX / 2, 0, 0]) cylinder(r = 4 / 2, h = BZ + 1, center = true, $fn = 50);
+                translate([BOLTSX / 2, 0, 0]) {
+                    cylinder(r = 4 / 2, h = BZ + 1, center = true, $fn = 50);
+                    translate([0, 0, 3]) m5_nut();
+                }
+                translate([-BOLTSX / 2, 0, 0]) {
+                    cylinder(r = 4 / 2, h = BZ + 1, center = true, $fn = 50);
+                    translate([0, 0, 3]) m5_nut();
+                }
             }   
         }
     }
@@ -74,11 +85,39 @@ module projector_arm () {
 }
 
 module filter_holder () {
-    
+    difference () {
+        cube([FILTER_X, 13.25, 50.5], center = true);
+        //center void
+        cube([42.4, 13.25 + 1, 50.5 + 1], center = true);
+        translate([0, (13.25/2) - (3.25/2) - 1, 0]) cube([FILTER_VOID_X, 3.25, 50.5 + 1], center = true);
+        translate([0, (13.25/2) - (3.25/2) - 1 - 3.25 - 1, 0]) cube([FILTER_VOID_X, 3.25, 50.5 + 1], center = true);
+    }
+}
+
+module filter_reinforcement () {
+    Z = 19.5 + 7.83;
+    X = AX;
+    difference () {
+        cube([X, 15.5, Z], center = true);
+        cube([FILTER_X - 0.1, 15.5 + 1, Z + 1], center = true);
+        translate([X - 19.5, -9, 0]) cube([X, 15.5, Z + 1], center = true);
+        translate([-X + 19.5, -9, 0]) cube([X, 15.5, Z + 1], center = true);
+    }
+}
+
+module roller_bolts () {
+
 }
 
 module jk_takeup () {
-    block();
+    difference () {
+        union () {
+            block();
+            translate([0, 0, -27.5]) filter_holder();
+            translate([0, -1.1, -16]) filter_reinforcement();
+        }
+        roller_bolts();
+    }
     translate([0, 0, 1.8]) {
         translate([-30, 0, 0]) rotate([0, 0, ARMS_ANGLE]) {
             translate([-ARM_LENGTH/2, 0, 2.75]) rotate([0, 0, 180]) projector_arm();
@@ -110,4 +149,5 @@ module jk_takeup_halves (HALF = "A") {
 //translate([0, 0, 40]) color("red") original_takeup();
 jk_takeup();
 //jk_takeup_halves();
-//color("blue") jk_takeup_halves("B");
\ No newline at end of file
+//color("blue") jk_takeup_halves("B");
+//m5_nut();
\ No newline at end of file