diff --git a/follow_focus.py b/follow_focus.py
index 3bf304d..efee86c 100644
--- a/follow_focus.py
+++ b/follow_focus.py
@@ -10,6 +10,7 @@ thickness=20
 rod_thickness=15.2
 loop_thickness=1.5
 stepper_motor_size=42
+lid_thicknesss = 5
 offset=9
 
 gap = stepper_motor_size * math.sin(math.radians(slant_degree)) / math.sin(math.radians(90-slant_degree))
@@ -61,15 +62,15 @@ base = base.edges('|Z').edges('<<Y[-2]').fillet(5)
 
 # 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()
-lid_thicknesss = 5
 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.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)
 
 # Stepper motor mount points
 stepper_hole_width=31.0
 stepper_hole_radius=stepper_hole_width/2*math.sqrt(2)
-stepper_center = cq.Workplane('XY').lineTo(0, offset).polarLine(stepper_motor_size/2, 90-slant_degree).polarLine(stepper_motor_size/2, -slant_degree).val().endPoint().toTuple()
+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)
 
 # Render