Thank you for the responses, all helpful. I discussed the missing and stripped set screws on the brass adapter bushing with a friend that knows Duffy's, he strongly suggested replacing it. I decided to go ahead and get a new main bearing as well, as long as I'm taking things apart, just for peace of mind. Folks at Duffy were helpful, and even sent me a PDF of the original owners manual for my year/boat. Still wish I could find a schematic though, I do better with pictures LOL . Next stop, packing gland! Thanks again.