Thanks , good info. Before seeing your reply i was looking into thses kinds of fixes. What are your thoughts?

https://www.youtube.com/watch?v=bezP0s0NtLc

Hi thanks for the advice. I wasn't that enamoured with putting the bolt back into the end of the crankshaft as i was worried about the amount of force on it messing internal threads up. So i constructed a pad to go between the puller and the crankshaft end. It took a hell of a lot of force but i got it off. The taper is damaged by the key breaking and gouging the shaft. Ill repair it best i can and loctite the taper.

Hello, i have acquired a cf500 that doesnt start. I think i have traced the problem to the woodruff key having moved on the flywheel as the tdc mark on the flywheel is way out when the piston is at TDC. I bought the correct puller but , my god the flywheel just doesnt want to budge, plenty of heat , the right too and i am stressing about putting so much force that it destroys the end of the craknshaft. Any advice??