You know, the joints that let arms or legs rotate, where one part is like a disc and slides into the other part of the leg or arm. They are mostly found on deluxes, and some scouts, since the TFTM/ROTF toy lines. You see, both my Generations Soundwave and Darkmount both suffer from poor quality joints and their appendages keep falling off. When I try to rotate Soundwave's right arm, or Darkmount's left leg, they pop right out of the joint. How do you repair these types or joints, so they don't come apart?