diff --git a/notes/stacking_debug.scad b/notes/stacking_debug.scad
new file mode 100644
index 0000000..8c13715
--- /dev/null
+++ b/notes/stacking_debug.scad
@@ -0,0 +1,99 @@
+/**
+ * Used to workshop the stacking screw 
+ * */
+
+module stacking_debug () {
+    translate([0, 0, 72 + 72 + 36]) {
+        color("blue") gnal_spindle_top();
+    }
+    translate([0, 0, 72 + 72]) rotate([0, 180, 0]) intersection () {
+        gnal_50ft_top();
+        cylinder(r = 50 / 2, h = 50, center = true);
+    }
+    
+    translate([0, 0, 72 + 30]) {
+        color("blue") rotate([0, 180, 0]) gnal_spindle_bottom();
+    }
+    
+    translate([0, 0, 72 + 36]) difference () {
+        cylinder(r = 50 / 2, h = 16, center = true);
+        cylinder(r = 22.5 / 2, h = 16 + 1, center = true);
+    }
+    
+    translate([0, 0, 36 + 30]) {
+        color("green") rotate([0, 180, 0]) gnal_stacking_spindle();
+    }
+    
+    translate([0, 0, 72]) difference () {
+        cylinder(r = 50 / 2, h = 16, center = true);
+        cylinder(r = 22.5 / 2, h = 16 + 1, center = true);
+    }
+    
+    translate([0, 0, 30]) {
+        color("green") rotate([0, 180, 0]) gnal_stacking_spindle();
+    }
+    
+    translate([0, 0, 36]) difference () {
+        cylinder(r = 50 / 2, h = 16, center = true);
+        cylinder(r = 22.5 / 2, h = 16 + 1, center = true);
+    }
+    
+    color("blue") translate([0, 0, 12 + 3]) gnal_spacer_16();
+    //#1 - bottom spiral
+    difference () {
+        cylinder(r = 50 / 2, h = 16, center = true);
+        cylinder(r = 22.5 / 2, h = 16 + 1, center = true);
+        translate([0, 0, -8]) spiral_insert_void();
+    }
+    
+    color("blue") translate([0, 0, -12]) gnal_spiral_bottom_insert_16();
+    
+}
+
+module stacking_debug2 () {
+    translate([0, 0, 72 + 47]) {
+        color("blue") gnal_spindle_top();
+    }
+    translate([0, 0, 72 + 26]) rotate([0, 180, 0]) intersection () {
+        gnal_50ft_top();
+        cylinder(r = 50 / 2, h = 50, center = true);
+    }
+    
+    translate([0, 0, 72 - 4]) {
+        color("blue") rotate([0, 180, 0]) gnal_spindle_bottom();
+    }
+    
+    translate([0, 0, 72 + 8]) difference () {
+        cylinder(r = 50 / 2, h = 16, center = true);
+        cylinder(r = 22.5 / 2, h = 16 + 1, center = true);
+    }
+    
+    translate([0, 0, 36 + 8]) {
+        color("green") rotate([0, 180, 0]) gnal_stacking_spindle();
+    }
+    
+    translate([0, 0, 55.5]) difference () {
+        cylinder(r = 50 / 2, h = 16, center = true);
+        cylinder(r = 22.5 / 2, h = 16 + 1, center = true);
+    }
+    
+    translate([0, 0, 20]) {
+        color("green") rotate([0, 180, 0]) gnal_stacking_spindle();
+    }
+    
+    translate([0, 0, 32]) difference () {
+        cylinder(r = 50 / 2, h = 16, center = true);
+        cylinder(r = 22.5 / 2, h = 16 + 1, center = true);
+    }
+    
+    color("blue") translate([0, 0, 12 + 3 + 5]) gnal_spacer_16();
+    //#1 - bottom spiral
+    translate([0, 0, 8]) difference () {
+        cylinder(r = 50 / 2, h = 16, center = true);
+        cylinder(r = 22.5 / 2, h = 16 + 1, center = true);
+        translate([0, 0, -8]) spiral_insert_void();
+    }
+    color("blue") translate([0, 0, 11]) gnal_spiral_bottom_insert_16();
+    H = 120;
+    translate([0, 0, H / 2 - 2]) color("red") cube([1, 50, H], center = true);
+}
\ No newline at end of file