I bought a like new wood chipper with a Tecumseh HM100 that had a damaged chipper housing. I'm not interested in the chipper, but how to get the chipper head off of the crank. It seems to have a short pto shaft with a 3/8 fine thread. The hub of the chipper head looks like it sticks out off the crank about 1 1/2" with a 7/16 fine threaded hole. I'm thinking I need to thread a long bolt in here til it hits the end of the crank and starts forcing the chipper off. There are no setscrews or any thing of that sort. Has anyone worked on one of these?? Am I thinking right, or way off ??? That's the only way I can see to get it off, but would like to know for sure.