diff --git a/follow_focus.py b/follow_focus.py
index c9f915f..60a0c15 100644
--- a/follow_focus.py
+++ b/follow_focus.py
@@ -30,7 +30,7 @@ loop_width=wall_width
 loop_angle=40
 rod_diameter=15.2
 offset=9
-tab_height=7
+tab_height=6
 tab_width=25
 
 # Gears
@@ -53,6 +53,23 @@ end_y=-4.3
 outer_ring_diameter=rod_diameter+2*loop_width
 center_x=end_x-math.cos(math.radians(loop_angle))*outer_ring_diameter/2
 center_y=end_y-math.sin(math.radians(loop_angle))*outer_ring_diameter/2
+# Stepper motor mount points
+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()
+
+e = cq.Workplane('XY').lineTo(0,offset).polarLine(stepper_motor_size, 90-slant_degree).hLine(width)
+end = e.val().endPoint().toTuple()
+e = e.polarLine(support_radius,180-slant_degree).val().endPoint().toTuple()
+slope = math.tan(math.radians(90-slant_degree))
+b = e[1] - slope*e[0]
+support_y = end[1]-support_radius
+support_x = (support_y-b)/slope
+
+lg_x=support_x-stepper_center[0]
+lg_y=support_y-stepper_center[1]
 
 def findRodInter(n_x, n_y):
     p = Point(center_x, center_y)
@@ -115,12 +132,6 @@ base = base.faces('<<Z[0]').workplane().vLine(offset+loop_width, forConstruction
                                        .hLine(-2*stepper_motor_size)\
                                        .close().cutBlind(-lid_thicknesss)
 
-# Stepper motor mount points
-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()
 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)),\
@@ -144,7 +155,7 @@ lid = lid.faces('>Z[1]').workplane().center(stepper_center[0], -stepper_center[1
                                     .circle(5).extrude(lid_thicknesss-wall_width)
 lid = lid.faces('>Z[0]').workplane().circle(5/2).cutThruAll()
 
-base = base.faces('<Z[1]').workplane().center(21,20.15).circle(26.5).cutBlind(-gear_thinkness-gear_gap)
+base = base.faces('<Z[1]').workplane().center(lg_x, lg_y).circle(26.5).cutBlind(-gear_thinkness-gear_gap)
 base = base.faces('<Z[2]').workplane().hLine(support_radius, forConstruction=True)\
                                       .threePointArc((-support_radius,-support_radius/2),(0,support_radius))\
                                       .polarLine(support_radius, -slant_degree)\
@@ -170,7 +181,7 @@ fastener = fastener.faces('<<Y[-1]').center(fastener_length,0)\
 fastener = fastener.faces('<<Y[-6]').workplane().circle(5/2).cutThruAll()
 
 # Lid large gear mount point
-lid = lid.faces('>Z[0]').workplane().center(21,-20.15)\
+lid = lid.faces('>Z[0]').workplane().center(lg_x,-lg_y)\
                                     .hLine(support_radius, forConstruction=True)\
                                     .threePointArc((-support_radius, support_radius/2),(0,-support_radius))\
                                     .polarLine(support_radius, slant_degree)\