diff --git a/follow_focus.py b/follow_focus.py
index 1d7b0c4..3b2e31c 100644
--- a/follow_focus.py
+++ b/follow_focus.py
@@ -182,9 +182,12 @@ base = base.faces('<<Y[-1]').workplane().circle(8.5/2).cutBlind(-support_radius-
 base = base.faces('<<Y[-1]').workplane().circle(fastener_width/2+fastener_gap).cutBlind(-fastener_hole_depth)
 fastener = base.faces('<<Y[-4]').workplane().circle(fastener_width/2)\
                                             .extrude(fastener_hole_depth+fastener_h_spacing+fastener_height, combine=False)
+
 fastener = fastener.faces('<<Y[-1]').workplane().center(-fastener_length,0)\
-                                                .line(20,-fastener_width/2)\
+                                                .vLine(-fastener_width/18)\
+                                                .lineTo(fastener_length,-fastener_width/2)\
                                                 .vLine(fastener_width)\
+                                                .lineTo(0,fastener_width/18)\
                                                 .close().extrude(-fastener_height)
 fastener = fastener.faces('<<Y[-1]').workplane().circle(fastener_width/6).extrude(-fastener_height)
 fastener = fastener.faces('<<Y[-1]').center(fastener_length,0)\