diff --git a/nhf/touhou/yasaka_kanako/onbashira.py b/nhf/touhou/yasaka_kanako/onbashira.py
index 8f40f20..abc105b 100644
--- a/nhf/touhou/yasaka_kanako/onbashira.py
+++ b/nhf/touhou/yasaka_kanako/onbashira.py
@@ -11,7 +11,7 @@ class Onbashira(Model):
 
     n_side: int = 6
     # Dimensions of each side panel
-    side_width: float = 170.0
+    side_width: float = 150.0
 
     # Side panels have different lengths
     side_length1: float = 200.0
@@ -38,7 +38,7 @@ class Onbashira(Model):
         (40, 12),
     ])
     angle_joint_flange_thickness: float = 7.8
-    angle_joint_flange_radius: float = 40.0
+    angle_joint_flange_radius: float = 30.0
     angle_joint_conn_thickness: float = 6.0
     angle_joint_conn_depth: float = 20.0
     angle_joint_conn_width: float = 20.0
@@ -50,23 +50,23 @@ class Onbashira(Model):
     barrel_diam: float = 25.4 * 1.5
     barrel_length: float = 300.0
     # Radius from barrel centre to axis
-    rotation_radius: float = 75.0
-    n_bearing_balls: int = 24
+    rotation_radius: float = 66.0
+    n_bearing_balls: int = 12
     # Size of ball bearings
     bearing_ball_diam: float = 25.4 * 1/2
     bearing_ball_gap: float = .5
     # Thickness of bearing disks
     bearing_thickness: float = 20.0
-    bearing_track_radius: float = 110.0
+    bearing_track_radius: float = 100.0
     # Gap between the inner and outer bearing disks
     bearing_gap: float = 10.0
     bearing_disk_thickness: float = 25.4 / 8
 
     rotor_inner_radius: float = 40.0
     rotor_bind_bolt_diam: float = 6.0
-    rotor_bind_radius: float = 85.0
+    rotor_bind_radius: float = 78.0
     rotor_spacer_outer_diam: float = 15.0
-    stator_bind_radius: float = 140.0
+    stator_bind_radius: float = 130.0
 
     material_side: Material = Material.WOOD_BIRCH
     material_bearing: Material = Material.PLASTIC_PLA
@@ -88,6 +88,9 @@ class Onbashira(Model):
         assert self.angle_joint_depth / 2 > self.angle_joint_conn_depth
         assert self.angle_joint_thickness > self.angle_joint_conn_thickness
 
+        # Ensure the stator could be printed on a 12x12in board
+        assert self.side_width * 2 < 12 * 25.4
+
     @property
     def angle_side(self) -> float:
         return 360 / self.n_side