diff --git a/nhf/touhou/yasaka_kanako/onbashira.py b/nhf/touhou/yasaka_kanako/onbashira.py
index 60773a9..4eafbb7 100644
--- a/nhf/touhou/yasaka_kanako/onbashira.py
+++ b/nhf/touhou/yasaka_kanako/onbashira.py
@@ -1586,7 +1586,7 @@ class Onbashira(Model):
             .translate((0, 0, -self.front_bracket_depth/2))
         )
         hole_subtractor = Cq.Solid.makeCylinder(
-            radius=BOLT_COMMON.diam_thread/2 * 1.5,
+            radius=(BOLT_COMMON.diam_thread + 2)/2,
             height=self.bulk_radius,
             dir=(1, 0, 0)
         )
@@ -1867,7 +1867,7 @@ class Onbashira(Model):
                 angle=shift,
                 mode="c", tag="bolt")
             .vertices(tag="bolt")
-            .circle(self.rotor_bind_bolt_diam/2, mode="s")
+            .circle(BOLT_COMMON.diam_thread/2, mode="s")
         )
     def chamber_back(self) -> Cq.Workplane:
         sketch = self.profile_chamber_back()