diff --git a/nhf/touhou/houjuu_nue/wing.py b/nhf/touhou/houjuu_nue/wing.py
index 548e1d7..41b3300 100644
--- a/nhf/touhou/houjuu_nue/wing.py
+++ b/nhf/touhou/houjuu_nue/wing.py
@@ -391,10 +391,12 @@ class WingProfile(Model):
             radius: float,
             angle_span: float,
             bot: bool = False) -> Cq.Sketch:
+        """
+        Creates a sector profile which accomodates extension
+        """
         sign = -1 if bot else 1
-        #sign = -1
-        axle_loc = axle_loc * Cq.Location.rot2d(180 if bot else 0)
-        loc_h = Cq.Location.from2d(0, radius)
+        axle_loc = axle_loc * Cq.Location.rot2d(-90 if bot else 90)
+        loc_h = Cq.Location.from2d(radius, 0)
         start = axle_loc * loc_h
         mid = axle_loc * Cq.Location.rot2d(-sign * angle_span/2) * loc_h
         end = axle_loc * Cq.Location.rot2d(-sign * angle_span) * loc_h
@@ -525,7 +527,7 @@ class WingProfile(Model):
                 axle_loc=self.elbow_axle_loc,
                 radius=self.elbow_height / 2,
                 angle_span=self.elbow_joint.motion_span,
-                bot=True,
+                bot=not self.flip,
             ), mode='a')
         )
     def surface_s1_bridge(self, front: bool = True) -> Cq.Workplane:
@@ -636,7 +638,7 @@ class WingProfile(Model):
             axle_loc=self.wrist_axle_loc,
             radius=self.wrist_height * (0.5 if self.flip else 1),
             angle_span=self.wrist_joint.motion_span,
-            bot=False,
+            bot=self.flip,
         )
         # Generates the contraction (cut) profile. only required on the left
         if self.flip: