I was trying to pull the flywheel off of my Rebel and, for the second time, I stripped the threads on the puller. I was in the middle of cutting into the flywheel at this point, so I figured I’d just cut the problem threads off, and it worked! Well, it worked as far as the threads being usable again.
You could do this with just a dremel and cutting wheel, or a drill arbor and cutting wheel for a drill, so you definitely don’t need a die grinder for it. The metal was a lot softer than I thought. Probably to keep from ruining the flywheel.
Oh – I also used the cutting wheel to bevel the edges a bit, so it would go in easier.
And make sure that the puller has a flat surface on the end, you don’t want to damage the crank.