diff --git a/follow_focus.py b/follow_focus.py
index c29f670..943fd4c 100644
--- a/follow_focus.py
+++ b/follow_focus.py
@@ -9,10 +9,12 @@ slant_degree=15.0
 thickness=20
 rod_thickness=15.2
 loop_thickness=1.5
+wall_width=1.6
 stepper_motor_size=42
 lid_thicknesss = 5
 offset=9
 part_thinkness=20
+gear_thinkness=10
 
 gap = stepper_motor_size * math.sin(math.radians(slant_degree)) / math.sin(math.radians(90-slant_degree))
 width = math.sqrt(gap**2 + stepper_motor_size**2 - 2*gap*stepper_motor_size*math.cos(math.radians(90)))
@@ -72,7 +74,7 @@ base = createOutline(part_thinkness)
 # Shell
 copy = base.faces('>>Z[0]').workplane().center(0, -offset-loop_thickness).polarLine(stepper_motor_size, slant_degree).polarLine(-2*stepper_motor_size, 90+slant_degree).hLine(-2*stepper_motor_size).close().cutThruAll()
 copy = copy.faces('+Z').workplane().center(0, -offset-loop_thickness).polarLine(2*stepper_motor_size,-slant_degree).vLine(stepper_motor_size).hLine(-2*stepper_motor_size).close().cutBlind(-lid_thicknesss)
-base = base.faces('+Z').shell(-1.6)
+base = base.faces('+Z').shell(-wall_width)
 base = base.add(copy)
 base = base.faces('<<Z[0]').workplane().center(0, offset+loop_thickness).polarLine(stepper_motor_size, -slant_degree).polarLine(stepper_motor_size, -slant_degree-3.75).vLine(2*stepper_motor_size).hLine(-2*stepper_motor_size).close().cutBlind(-lid_thicknesss)
 
@@ -80,9 +82,16 @@ base = base.faces('<<Z[0]').workplane().center(0, offset+loop_thickness).polarLi
 stepper_hole_width=31.0
 stepper_hole_radius=stepper_hole_width/2*math.sqrt(2)
 stepper_center = cq.Workplane('XY').center(0, -offset-loop_thickness).lineTo(0, offset).polarLine(stepper_motor_size/2, 90-slant_degree).polarLine(stepper_motor_size/2, -slant_degree).val().endPoint().toTuple()
-base = base.faces('>>Z[0]').workplane().center(stepper_center[0], -stepper_center[1]).circle(22.5/2).pushPoints([(stepper_hole_radius*math.cos(math.radians(45+slant_degree)),stepper_hole_radius*math.sin(math.radians(45+slant_degree))), (stepper_hole_radius*math.cos(math.radians(135+slant_degree)),stepper_hole_radius*math.sin(math.radians(135+slant_degree))),(stepper_hole_radius*math.cos(math.radians(225+slant_degree)),stepper_hole_radius*math.sin(math.radians(225+slant_degree))),(stepper_hole_radius*math.cos(math.radians(315+slant_degree)),stepper_hole_radius*math.sin(math.radians(315+slant_degree)))]).circle(3/2).cutBlind(-1.6)
+base = base.faces('>>Z[0]').workplane().center(stepper_center[0], -stepper_center[1]).circle(22.5/2).pushPoints([(stepper_hole_radius*math.cos(math.radians(45+slant_degree)),stepper_hole_radius*math.sin(math.radians(45+slant_degree))), (stepper_hole_radius*math.cos(math.radians(135+slant_degree)),stepper_hole_radius*math.sin(math.radians(135+slant_degree))),(stepper_hole_radius*math.cos(math.radians(225+slant_degree)),stepper_hole_radius*math.sin(math.radians(225+slant_degree))),(stepper_hole_radius*math.cos(math.radians(315+slant_degree)),stepper_hole_radius*math.sin(math.radians(315+slant_degree)))]).circle(3/2).cutBlind(-wall_width)
 
 lid = lid.cut(base)
+copy = lid.faces('>>Z[0]').workplane().center(0, -offset-loop_thickness).polarLine(stepper_motor_size*2, slant_degree).polarLine(-2*stepper_motor_size, 90+slant_degree).hLine(-3*stepper_motor_size).close().cutThruAll()
+lid = lid.faces('>Z[0]').shell(.000001-wall_width)
+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()
 
 # Render
 show_object(base, name='Follow Focus Base')