diff --git a/follow_focus.py b/follow_focus.py
index 5eed578..5f6932f 100644
--- a/follow_focus.py
+++ b/follow_focus.py
@@ -93,6 +93,7 @@ lid = lid.add(copy)
 
 lid = lid.faces('>Z[1]').workplane().center(stepper_center[0], -stepper_center[1]-offset-loop_thickness).circle(5).extrude(lid_thicknesss-wall_width)
 lid = lid.faces('>Z[0]').workplane().circle(5/2).cutThruAll()
+
 gear_gap=0.2
 base = base.faces('<Z[1]').workplane().center(21,20.15).circle(25).cutBlind(-gear_thinkness-gear_gap)
 base = base.faces('<Z[2]').workplane().circle(11/2).extrude(-lid_thicknesss+wall_width)
@@ -100,6 +101,13 @@ gear_offset=0.5
 base = base.faces('<Z[2]').workplane().circle(large_gear_diameter/2-gear_offset).extrude(gear_thinkness/2)
 base = base.faces('<Z[2]').workplane().circle(2).cutBlind(-part_thinkness/2+wall_width)
 
+lid = lid.faces('>Z[0]').workplane().center(21,-20.15).circle(11/2).extrude(-lid_thicknesss+wall_width)
+lid = lid.faces('>Z[0]').workplane().circle(large_gear_diameter/2-gear_offset).extrude(gear_thinkness/2)
+lid = lid.faces('>Z[0]').workplane().circle(2).cutThruAll()
+m_hole_diameter=6
+m_hole_depth=3
+lid = lid.faces('<Z[0]').workplane().circle(m_hole_diameter/2).cutBlind(-m_hole_depth)
+
 # Render
 show_object(base, name='Follow Focus Base')
 show_object(lid, name='Follow Focus Lid')