diff --git a/chris_king_adapter.scad b/chris_king_adapter.scad
new file mode 100644
index 0000000..dbdb531
--- /dev/null
+++ b/chris_king_adapter.scad
@@ -0,0 +1,12 @@
+in=30;
+out=44.3;
+shaft=16.5;
+
+
+difference() {
+    union(){
+        cylinder(r1=in/2, r2=in/2, h=20, $fn=80);
+        cylinder(r1=out/2, r2=out/2, h=12, $fn=80);
+    }
+    cylinder(r1=shaft/2, r2=shaft/2, h=20, $fn=80);
+}