I usually just put flat aluminum covers over the jaws of my vice grip so the teeth do not score the arms themselves, clamp it on and then wiggle it back and forth. When you get them off just put the arm down on a cloth on your bench, whack the rivet inside with a drift pin and hammer that holds the spring inside the splined area to restore its place and loaded action and press the spring back to its normal tightened position. Put on a tiny amount of anti-seize for the next time, if you put too much it could come apart in the rain....DAMHIK