This is something I learned on a different Forum about booger or stripped crankshaft threads that I wanted to share. I am currently dealing with this issue and I read a post where a guy got the appropriately-sized die and cut it in half and then use a hose clamp to put the two halves back together around the crank and then gradually turned it, tighten hose clamp, turn it some more tighten the hose clamp, turn it some more until he got it completely closed and it seemed to work well. I think I would have to turn it down a size or something because my threads are pretty badly stripped but it might work for someone else.