Changing my timming belt and for the life of me cannot loosen the crankshaft harmonic balancer bolt. I'm using a Dewalt, 1/2 drive electric impact gun and it will not break loose. I want to try a breaker bar, but nothing holds the crank from turning. Will a cam sprocket locking tool work ? I'm thinking about apply heat to the bolt using a propane torch, but I'm afraid I'll melt the rubber bushing in the harmonic balancer. I am stuck and need any advice you members can offer.