diff --git a/takeup.scad b/takeup.scad
index 20a9ab1..9b82540 100755
--- a/takeup.scad
+++ b/takeup.scad
@@ -59,6 +59,7 @@ module magnetic_coupling (MAGNETS = 4, MAGNET_D = 8.1, MAGNET_H = 2.5) {
         union () {
             cylinder(r = COUPLING_D / 2, h = MAGNET_H + H, center = true, $fn = 100);
             translate([0, 0, -6]) cylinder(r = 12.5 / 2, h = 10, center = true, $fn = 60);
+            translate([0, 0, -5]) cylinder(r = 20 / 2, h = 5, center = true, $fn = 60);
         }
         //motor shaft void
         scale([1.1, 1.1, 2]) motor_shaft();
@@ -66,6 +67,15 @@ module magnetic_coupling (MAGNETS = 4, MAGNET_D = 8.1, MAGNET_H = 2.5) {
         for (i = [0 : MAGNETS - 1]) {
             rotate([0, 0, i * (360 / MAGNETS)]) translate([0, OFFSET, H - MAGNET_H + 1.01]) cylinder(r = MAGNET_D / 2, h = MAGNET_H, center = true, $fn = 50);
         }
+        //m3 nut
+        translate([6, 0, -9]) { 
+            cube([2.75, 5.75, 10], center = true);
+            translate([0, 0, 5]) rotate([0, 90, 0]) {
+                cylinder(r = 6.75/2, h = 2.75, center = true, $fn = 6);
+                translate([0, 0, 4]) cylinder(r = 3.25/2, h = 20, center = true, $fn = 30);
+                translate([0, 0, 13.5]) cylinder(r = 6/2, h = 20, center = true, $fn = 30);
+            }
+        }   
     }
 }