diff --git a/follow_focus.py b/follow_focus.py
index f8f65a4..02600ae 100644
--- a/follow_focus.py
+++ b/follow_focus.py
@@ -17,6 +17,7 @@ fastener_width=      11
 fastener_height=     3.5
 fastener_length=     20
 fastener_h_spacing=  .2
+fastener_gap=        .2
 
 # NEMA 17 stepper motor
 stepper_motor_size=  42.0
@@ -172,8 +173,9 @@ base = base.faces('<<Y[-1]').workplane().center(-5,0).circle(6.5/2).cutBlind(-su
 base = base.faces('<<Y[-1]').workplane().circle(8.5/2).cutBlind(-support_radius-mount_gap)
 
 # Fastener
-base = base.faces('<<Y[-1]').workplane().circle((fastener_width+1)/2).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)
+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)\