Good call, Bill. I've been asked to do a little work on props, but never wanted to build up a set of special jaws to accomplish what that chuck does. It makes sense that there is a factory chuck for the job. There was a little watersports shop here that used to send me lots of shafts from PWC's to straighten, and along with them a few props to fix, polish, broach new keyways, etc. Always made good money, because no one else wanted to mess with it, I guess. I never thought it was too difficult. They went out of business, so the gravy dried up.