diff --git a/nhf/touhou/houjuu_nue/joints.py b/nhf/touhou/houjuu_nue/joints.py
index 098a1cd..5461668 100644
--- a/nhf/touhou/houjuu_nue/joints.py
+++ b/nhf/touhou/houjuu_nue/joints.py
@@ -390,11 +390,12 @@ class ShoulderJoint(Model):
     angle_neutral: float = -15.0
     angle_max_deflection: float = 65.0
 
-    spool_radius: float = 14.0
+    spool_radius: float = 12.0
     spool_groove_depth: float = 1.0
     spool_base_height: float = 3.0
     spool_height: float = 5.0
-    spool_groove_inset: float = 2.0
+    spool_cap_height: float = 1.0
+    spool_groove_inset: float = 3.0
 
     flip: bool = False
     actuator: LinearActuator = LINEAR_ACTUATOR_21
@@ -554,17 +555,19 @@ class ShoulderJoint(Model):
         Generates the spool piece which holds the line in tension
         """
         t = self.spool_groove_depth
-        bulk = Cq.Solid.makeCylinder(
-            radius=self.spool_radius,
+        radius_core_inner = self.torsion_joint.radius_rider - self.child_core_thickness
+        spindle = Cq.Solid.makeCone(
+            radius1=self.spool_radius,
+            radius2=radius_core_inner,
             height=self.spool_height,
-        ).located(Cq.Location((0, 0, self.spool_base_height)))
-        base = Cq.Solid.makeCylinder(
-            radius=self.spool_radius - t,
-            height=self.spool_base_height,
         )
-        hole_x = self.spool_radius - (t + self.spool_groove_inset)
+        cap = Cq.Solid.makeCylinder(
+            radius=radius_core_inner,
+            height=self.spool_cap_height
+        ).located(Cq.Location((0,0,self.spool_height)))
+        hole_x = radius_core_inner - self.spool_groove_inset
         slot = Cq.Solid.makeBox(
-            length=t + self.spool_groove_inset,
+            length=t,
             width=t,
             height=self.spool_base_height,
         ).located(Cq.Location((hole_x, -t/2, 0)))
@@ -577,7 +580,7 @@ class ShoulderJoint(Model):
             radius=self.torsion_joint.radius_axle,
             height=self.spool_height + self.spool_base_height,
         )
-        return bulk.fuse(base).cut(slot, hole, centre_hole)
+        return spindle.fuse(cap).cut(slot, hole, centre_hole)
 
     @target(name="child")
     def child(self) -> Cq.Assembly:
@@ -618,6 +621,11 @@ class ShoulderJoint(Model):
                 width=self.child_lip_width - self.child_lip_thickness * 2,
                 height=self.child_lip_height,
             ).located(Cq.Location((0, self.child_lip_thickness, 0))))
+            .cut(Cq.Solid.makeBox(
+                length=self.child_lip_ext - self.child_guard_ext - self.child_lip_thickness,
+                width=self.child_lip_width,
+                height=self.child_lip_height - self.child_lip_thickness * 2,
+            ).located(Cq.Location((0, 0, self.child_lip_thickness))))
             .located(Cq.Location((
                 self.child_guard_ext,
                 -self.child_lip_width / 2,