eastwood has a nice impact/breaker bar. part#14509. its 99 bucks,but is ideal for this situation, as well as others. im sure you could possibly find one cheaper. it has the1/2" socket on one side, and a flat place to hit with a hammer on the opposite side, while you put pressure on the bar to loosen. but im with the others, pb lube is pretty awsome. and just my couple of pennies, when i come up on a tight frustrating bolt like this, i go buy a spare or two BEFORE i get things tore apart so im not walking to the parts store to get another.....you know, just in case it does break....you can always return it if not needed.