Arm gets shorter when I try to prevent joint rub?

Arm gets shorter when I try to prevent joint rub?
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Custom WorkstationHey guys, this might be an obvious question to a lot of you guys, but whenever I shave around the double hinge for the elbow to prevent joint rub and put it back together, the arm ends up shorter, any idea on what I'm doing wrong? Am I shaving off too much? I basically shaved around the entire 2 circles that make the elbow joint.

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You don't shave that nub on the ends, that's what gives the joints the ratcheting action.