I have REALY beat mine with a lot of force, pulling a rear drum off of a 40's Lincoln... Maybe a 3' bar, jumping on it . Who knows, 450+ foot pounds? ...With heat, using a BFH on the end. Would NOT let go... So, I took a disc and cut a slot in the hub outside of the key as far in as I could without hitting anything important... THAT did it...
So, I lube the threads with chassis grease and go til I get it... Point is, mine is the reproduction KR Wilson and I don't think that I can break it...
Karl