diff --git a/nhf/touhou/yasaka_kanako/onbashira.py b/nhf/touhou/yasaka_kanako/onbashira.py
index 8e79934..53ca1c0 100644
--- a/nhf/touhou/yasaka_kanako/onbashira.py
+++ b/nhf/touhou/yasaka_kanako/onbashira.py
@@ -149,6 +149,17 @@ class Onbashira(Model):
         dx = self.bearing_gap
         return math.sqrt(diag ** 2 - dx ** 2)
 
+    @target(name="sanding_block")
+    def sanding_block(self) -> Cq.Workplane:
+        x = 50.0
+        return (
+            Cq.Workplane()
+            .sketch()
+            .polygon([(0,0), (0, x), (x, x/2), (x, 0)])
+            .finalize()
+            .extrude(self.side_width * 1.5)
+        )
+
     @target(name="bearing-stator", kind=TargetKind.DXF)
     def profile_bearing_stator(self) -> Cq.Sketch:
         return (