I have 2 out of 5 chandelier arms in which I can not get the old wiring out. I am in the process of rewiring it and am having problems with the 2 remaining arms. There isn't much left sticking out of the arm to grab. Does ANYONE have ANY suggestions as to how I can get the old wiring out? I've thought of a copper solvent to break up the copper wire, but not sure if it would get through the plastic insulation. The arms are brass.