I am in the process of installing March underdrive pulleys on my 94 cobra...the problem I am having is getting the damn alternator pulley OFF!! is there an easy way to do it.....even my air impact gun wasn't able to loosen it up...PLEASE tell me I am able to get it off....I have already screwed up the old pulley's grooves by holding the pulley with a pair of pliars to keep it from moving....anyone can help????????