Originally Posted by
Kotts
.....Take the broken wheel and a casette lockring remover to your freindly neighborhood mechanic, and ask him to give it a quick burst with an impact wrench (set on reverse, of course), while you hold the casette with heavy gloves or a heavy rag......
I think Kotts is right about this. I had almost forgotten about this trick, and it does work for those impossible situations. Certainly worth a try if you have a remover that fits a socket on the air wrench.