diff --git a/cad/build.py b/cad/build.py
index 6629724..14adf63 100644
--- a/cad/build.py
+++ b/cad/build.py
@@ -1,14 +1,16 @@
 # pyright: reportUnusedCallResult=false, reportWildcardImportFromLibrary=false
 from build123d import *
 
-hole_offset = 20
-hole_diameter = 22
+bearing_offset = 20
+bearing_diameter = 22
+bearing_through_hole_diameter = 15
+bearing_height = 8
 
 core_width = 40
 thickness = 20
 
 screw_blocks_width = thickness
-screw_blocks_height = hole_offset
+screw_blocks_height = bearing_offset
 screw_blocks_radius = 3
 
 screw_head_diameter = 8.5
@@ -18,10 +20,10 @@ screw_body_diameter = 5
 track_width = 6.2
 track_height = 1.8
 
-assert (hole_offset - hole_diameter / 2) > 0
-assert (core_width - hole_diameter) > 0
+assert (bearing_offset - bearing_diameter / 2) > 0
+assert (core_width - bearing_diameter) > 0
 assert (screw_blocks_width - (screw_blocks_radius * 2)) >= 0
-assert (hole_offset - screw_blocks_height) >= 0
+assert (bearing_offset - screw_blocks_height) >= 0
 
 
 with BuildPart() as builder:
@@ -37,7 +39,7 @@ with BuildPart() as builder:
                 ((l1 @ 1).X, screw_blocks_height),
                 (core_width / 2, screw_blocks_height),
             )
-            match (float)(hole_offset - screw_blocks_height):
+            match (float)(bearing_offset - screw_blocks_height):
                 case 0:
                     FilletPolyline(
                         *polyline_path,
@@ -50,26 +52,29 @@ with BuildPart() as builder:
                     )
                     Line(
                         sbl @ 1,
-                        ((sbl @ 1).X, hole_offset)
+                        ((sbl @ 1).X, bearing_offset)
                     )
                 case len if len >= screw_blocks_radius:
                     FilletPolyline(
                         *polyline_path,
-                        (core_width / 2, hole_offset),
+                        (core_width / 2, bearing_offset),
                         radius=screw_blocks_radius
                     )
                 case _: assert False
 
-            CenterArc((0, hole_offset), core_width / 2, 90, -90)
+            CenterArc((0, bearing_offset), core_width / 2, 90, -90)
             mirror(profile.line, Plane.YZ)
         make_face()
 
-        with Locations((0, hole_offset)):
-            Circle(hole_diameter / 2, mode=Mode.SUBTRACT)
+        with Locations((0, bearing_offset)):
+            Circle(bearing_through_hole_diameter / 2, mode=Mode.SUBTRACT)
 
     extrude(amount=thickness / 2)
     mirror(about=Plane.XY)
 
+    with Locations((0, bearing_offset, builder.faces().sort_by(Axis.Z)[-1].center().Z)):
+        Hole(bearing_diameter / 2, bearing_height)
+
     Box(core_width + (screw_blocks_width * 2), track_width, track_height, (90, 0, 0), (Align.CENTER, Align.CENTER, Align.MIN))
 
     with Locations(builder.faces().filter_by(Plane.XZ).sort_by(Axis.Y)[-2:]):