diff --git a/fan_control_box.py b/fan_control_box.py
index f919284..1cedfd1 100644
--- a/fan_control_box.py
+++ b/fan_control_box.py
@@ -29,12 +29,11 @@ barrel_diameter = 11
 
 # digikey perfboard
 # It's the distance to the *middle* of the hole
-breadboard_height = 81
+breadboard_height = 68.68
 breadboard_width = 50.8
 
 bb_hole_dist_from_top = 5.37
 bb_hole_dist_from_side = 25.23
-
 bb_hole_diameter = 2.76
 
 # buck converter
@@ -53,7 +52,7 @@ lbc_width = 57.8
 
 lbc_hole_dist_from_top = 4.5
 lbc_hole_dist_from_side = 25.8
-lbc_hole_diameter = 7.0
+lbc_hole_diameter = 5.8
 lbc_hole_radius = lbc_hole_diameter / 2.0
 
 wall_thickness = 3
@@ -65,7 +64,8 @@ wall_thickness = 3
 box_radius = 87 + wall_thickness
 box_thickness = 25
 
-pole_height = box_thickness - 2
+pole_height = box_thickness - 3
+inner_pole_height = 13
 pole_dist = 3
 
 lower_box = Workplane()
@@ -105,64 +105,66 @@ def make_component_holder_octogon(
             )
         )
         .vertices()
-        .threadedHole(top_screw, pole_height * 0.4, simple=screw_simple)
+        .threadedHole(top_screw, pole_height * 0.6, simple=screw_simple, fit="Close")
     )
 
 
 def make_component_holder_line(
     result,
     pole_height=0,
+    pole_radius=3,
     line_x_dist=0,
     line_y_dist=0,
     x_offset=0,
     y_offset=0,
 ):
     return (
-        result.workplane(offset=(pole_height / 2) - wall_thickness)
+        result.workplane(offset=(wall_thickness / 2.0))
         .move(x_offset, y_offset)
         .line(
             line_x_dist,
             line_y_dist,
         )
         .vertices()
-        .cylinder(pole_height, 3)
-        .workplane(offset=(pole_height - wall_thickness + 1.5))
+        .cylinder(inner_pole_height, pole_radius)
+        .workplane(offset=(wall_thickness * 2) + 3.7)
         .move(x_offset, y_offset)
         .line(
             line_x_dist,
             line_y_dist,
         )
         .vertices()
-        .threadedHole(top_screw, pole_height * 0.4, simple=screw_simple)
+        .threadedHole(top_screw, inner_pole_height, simple=screw_simple, fit="Close")
     )
 
 
 def make_component_holder(
     result,
     pole_dist,
-    pole_height,
-    box_width,
-    box_height,
+    pole_height=0,
+    pole_radius=3,
+    box_width=None,
+    box_height=None,
     x_offset=0,
     y_offset=0,
 ):
     return (
-        result.workplane(offset=(pole_height / 2) - wall_thickness)
+        result.workplane(offset=(wall_thickness / 2.0))
         .move(x_offset, y_offset)
         .rect(
             box_height,
             box_width,
         )
         .vertices()
-        .cylinder(pole_height, 3)
-        .workplane(offset=(pole_height - wall_thickness + 1.5))
+        .cylinder(inner_pole_height, pole_radius)
+        .workplane(offset=(wall_thickness * 2) + 3.7)
         .move(x_offset, y_offset)
         .rect(
             box_height,
             box_width,
         )
         .vertices()
-        .threadedHole(top_screw, pole_height * 0.4, simple=screw_simple)
+        .threadedHole(top_screw, inner_pole_height, simple=screw_simple, fit="Close")
     )
 
 
@@ -218,23 +220,38 @@ lower_box = make_component_holder(
 lower_box = make_component_holder(
     lower_box,
     pole_dist,
-    10,
-    breadboard_width,
-    breadboard_height,
+    pole_height=5,
+    box_width=breadboard_width,
+    box_height=breadboard_height,
     x_offset=0,
     y_offset=40,
 )
 
 lower_box = make_component_holder_line(
     lower_box,
-    pole_height=8,
+    pole_height=5,
+    line_x_dist=breadboard_height,
+    line_y_dist=0,
+    x_offset=-(breadboard_height / 2.0),
+    y_offset=40,
+)
+
+bc_pole_radius = 4
+lower_box =  lower_box.workplane(offset=(wall_thickness / 2.0)).move(-(lbc_height/2.0), -25).box(5, lbc_width-5, 13)
+lower_box =  lower_box.workplane(offset=(wall_thickness / 2.0)).move(lbc_height/2.0 - bc_pole_radius*2, -25).box(5, lbc_width-5, 13)
+lower_box = make_component_holder_line(
+    lower_box,
+    pole_height=6,
+    pole_radius=bc_pole_radius,
     line_x_dist=lbc_height - lbc_hole_diameter - lbc_hole_radius,
     line_y_dist=0,
     x_offset=-(lbc_height / 2.0),
     y_offset=-(lbc_width / 2.5),
 )
 
-cq.exporters.export(lower_box, "/home/deck/model_files/fan_control_box_lower.step")
+#lower_box =  lower_box.workplane(offset=(wall_thickness / 2.0)).box(lbc_height, 5, 13)
+
+cq.exporters.export(lower_box, "/home/deck/model_files/fan_control_box_lower.stl")
 
 try:
     show_object(lower_box)