diff --git a/nhf/touhou/yasaka_kanako/onbashira.py b/nhf/touhou/yasaka_kanako/onbashira.py
index 3007027..46b1367 100644
--- a/nhf/touhou/yasaka_kanako/onbashira.py
+++ b/nhf/touhou/yasaka_kanako/onbashira.py
@@ -28,7 +28,7 @@ class Onbashira(Model):
     # Gap of each angle joint to connect the outside to the inside
     angle_joint_gap: float = 10.0
     angle_joint_bolt_length: float = 50.0
-    angle_joint_bolt_diam: float = 10.0
+    angle_joint_bolt_diam: float = 8.0
     # Position of the holes, with (0, 0) being the centre of each side
     angle_joint_bolt_position: list[float] = field(default_factory=lambda: [
         (20, 10),
@@ -55,7 +55,7 @@ class Onbashira(Model):
 
     rotor_inner_radius: float = 40.0
 
-    rotor_bind_bolt_diam: float = 10.0
+    rotor_bind_bolt_diam: float = 8.0
     rotor_bind_radius: float = 85.0
     stator_bind_radius: float = 140.0