diff --git a/nhf/touhou/houjuu_nue/__init__.py b/nhf/touhou/houjuu_nue/__init__.py
index 6e3254d..1f1ce0d 100644
--- a/nhf/touhou/houjuu_nue/__init__.py
+++ b/nhf/touhou/houjuu_nue/__init__.py
@@ -97,14 +97,18 @@ class Parameters(Model):
     wing_root_wall_thickness: float = 8
 
     shoulder_torsion_joint: TorsionJoint = field(default_factory=lambda: TorsionJoint(
-        radius_track=35,
-        radius_rider=35,
-        groove_radius_outer=32,
+        radius_track=18,
+        radius_rider=18,
+        groove_radius_outer=16,
+        groove_radius_inner=13,
         track_disk_height=5.0,
-        rider_disk_height=7.0,
-        radius_axle=8.0,
-        radius_spring=9 + 1.2 * 2,
+        rider_disk_height=5.0,
+        # M8 Axle
+        radius_axle=3.0,
+        # inner diameter = 9
+        radius_spring=9/2 + 1.2,
         spring_thickness=1.3,
+        spring_height=7.5,
     ))
 
     # Two holes on each side (top and bottom) are used to attach the shoulder