yea, they move around. its normal. however, in rare occasions, the little disk that sits between the arm and the actual binding, can get crushed. the binding will still lock and close, but they have some slop. if that ever happens to be the case, its a pretty easy replacement. you just drill out the little rivet ends, and pull the heelstop out, disasemble them, and replace the part with one from a pair of doner bindings. epoxy the heelstop back in, and your done. i never watched the vid, cause my internet is being gay, but if they are newer, i almost garentee its not the problem. they just float around when not clamped in.
