The spurs are sometimes bent, If you warm it up then put the slipper on, make sure its all on good and straight then tighten the slipper nut up all the way. Then leave it overnight it should be straight(er) if not straight. You can try putting the spur in hot water for a while first then tighten it up. Once it's straight then you can loosen the slipper again so it slips before the diff slips
