Goalie, I think, if you can buy the gear, you will have to apply heat to remove it and then reverse the process to reinstall it. This will be like changing tires on an old steam train engine's drive wheels. It might be hard to find one of those old boys to help you out. I like what an old man told me about an angry engine I once had in for repair. He said, "If man made it I can fix it. If God made it sometimes I can and sometimes I can't." He fixed my engine and he was 92 years old. It shouldn't cost anymore than $80-$100 to repair the motor and put a bendix gear on it. The ring gear I don't have an idea but I think the post on the leading edge being there is correct. Good luck. Going to go watch the sugar cane burn today and enjoy the 80F temps. That will fix most things.