I've had good luck just using an impact on the outermost hex portion of the pully assembly and if needed adding a little heat to loosen the loctite holding it to the crank pulley. This eliminates having to sawzall through that center shaft.

Rick

Owner of 00 #1611 Silver (Totalled) 98.5 T-Red SVT #6180 Buckshot77@msn.com Misc 3L parts for sale