diff --git a/powder-loader.scad b/powder-loader.scad
index a0cf90b..688c591 100644
--- a/powder-loader.scad
+++ b/powder-loader.scad
@@ -8,6 +8,11 @@ top_height = 20;
 
 opening_sep = 0.1;
 
+screw_hole_diam = 2;
+screw_hole_depth = 12;
+screw_diam = 3;
+screw_spacer_diam = 10;
+
 border = 1;
 
 funnel_size = 1;
@@ -38,9 +43,18 @@ color("#777")
 overall_cylinder();
 
 module bottom() {
-    for(i = [0:5]) {
-        rotate([0, 0, i / 6 * 360])
-        bottom_part();
+    difference() {
+        union()
+        for(i = [0:5]) {
+            rotate([0, 0, i / 6 * 360])
+            bottom_part();
+        }
+
+        translate([0, 0, -1])
+        cylinder(d = screw_diam + 1, h = bottom_height + 2);
+
+        translate([0, 0, -1])
+        cylinder(d = screw_spacer_diam, h = 2 + 1);
     }
 }
 
@@ -80,9 +94,15 @@ color("#dd08")
 bottom();
 
 module top() {
-    for(i = [0:5]) {
-        rotate([0, 0, i / 6 * 360])
-        top_part();
+    difference() {
+        union()
+        for(i = [0:5]) {
+            rotate([0, 0, i / 6 * 360])
+            top_part();
+        }
+
+        translate([0, 0, -1])
+        cylinder(d = screw_hole_diam, h = screw_hole_depth + 1);
     }
 }