Wonderful set, Patrick and wonderful looking Mustang. The shaft of your washer is probably not damaged, its the brass keyway at the bottom of the spin tube assembly that has gotten damaged. The brass keyway serves as both a bearing for the agitate shaft, and also as a keyway to keep it from turning and twisting the bellows. The shaft is hardened steel and very hard to hurt, but the brass keyway is soft and easily snapped. Ive done it many times trying to get the big nut off the pulsator. The noise is usually a bad agitate arm and or a loose agitator cone(s). The best way to remove the agitator now is to unscrew the shaft from the agitate arm (at the bottome of the tranny), unsnap the bellows retainer rings (big one and small one under the pulsator) and remove the complete agitator and shaft in one piece. Its pretty easy to then disassemble the cones from the shaft. Next step would be to find a donor tranny to get a good spin shaft from. Good luck, its really not as difficult as it sounds!