What rubber? I guess when I did my top swap I was just replacing my harmonic balancer with another one I didn't heat, but where is there rubber on the balancer? Only thing I would be worried about is possibly melting the crank seal maybe but hmm I guess I am confused about melting the balancer? All the guys I have talked to and my myself used heat to get it off. I am not talking about getting it RED hot but just enough to loosen the red stuff on the flange of the crank bolt.