Turke,
I replaced my old crankshaft pulley also. The old one made the whole engine wobble. Carl's instructions a dead on.
I will add that I got my replacement pulley from Walcks. It was a little disappointing to me that the new pulley still has a slight wobble.
I think it's Pete Debella that does a pulley that is machined from a solid chunk of steel vs the stamped style. It's 6 times the $$$$, but I am now considering it.
Don't get me wrong, I have nothing but admiration for Walcks, but I think his pulley is the same pulley everyone has access to. Probably Omix Ada.
Tim