diff --git a/src/dactyl_keyboard/dactyl.clj b/src/dactyl_keyboard/dactyl.clj
index db44258..ac5e7d9 100644
--- a/src/dactyl_keyboard/dactyl.clj
+++ b/src/dactyl_keyboard/dactyl.clj
@@ -618,7 +618,7 @@
 (defn screw-insert-all-shapes [bottom-radius top-radius height]
   (union (screw-insert 0 0         bottom-radius top-radius height [9 9 0])
          (screw-insert 0 lastrow   bottom-radius top-radius height [1 8 0])
-         (screw-insert 3 lastrow  bottom-radius top-radius height [9 4 0])
+         (screw-insert lastcol lastrow  bottom-radius top-radius height [-5 13 0])
          (screw-insert lastcol 0         bottom-radius top-radius height [-3 6 0])
          (screw-insert 1 lastrow         bottom-radius top-radius height [0 -16 0])))