diff --git a/nhf/touhou/houjuu_nue/wing.py b/nhf/touhou/houjuu_nue/wing.py
index 49b3283..eb1aeaf 100644
--- a/nhf/touhou/houjuu_nue/wing.py
+++ b/nhf/touhou/houjuu_nue/wing.py
@@ -62,8 +62,8 @@ class WingProfile(Model):
     shoulder_base_bezier_x: float = -30.0
     shoulder_base_bezier_y: float = 30.0
 
-    s0_hole_loc: Cq.Location = Cq.Location.from2d(-25, 33)
-    s0_hole_diam: float = 15.0
+    s0_hole_width: float = 40.0
+    s0_hole_height: float = 10.0
     s0_top_hole: bool = False
     s0_bot_hole: bool = True
 
@@ -235,11 +235,17 @@ class WingProfile(Model):
         )
         top = top == self.flip
         if (self.s0_top_hole and top) or (self.s0_bot_hole and not top):
+            assert self.base_width > self.s0_hole_width
+            x = (self.base_width - self.s0_hole_width) / 2
             sketch = (
                 sketch
                 .reset()
-                .push([self.s0_hole_loc.to2d_pos()])
-                .circle(self.s0_hole_diam / 2, mode='s')
+                .polygon([
+                    (-x, 0),
+                    (-x, self.s0_hole_height),
+                    (-self.base_width + x, self.s0_hole_height),
+                    (-self.base_width + x, 0),
+                ], mode='s')
             )
         return sketch