diff --git a/cad/build.py b/cad/build.py
index 154d188..9991eb0 100644
--- a/cad/build.py
+++ b/cad/build.py
@@ -7,7 +7,7 @@ def build_drive_shaft_mount():
     bearing_diameter = 22
     bearing_through_hole_diameter = 15
     bearing_height = 7
-    shaft_clearance_diameter = 25
+    shaft_clearance_diameter = 25.5
 
     core_width = 40
     thickness = 20