These are a couple of things I learned from the ones Ive had. If you heat the gear case with a heat gun, the cartage that you had to use a puller to get out, will drop back in. https://youtu.be/TvZdUuhJAgU A piece of pvc tubing is really helpful getting the impeller in. https://youtu.be/twwfih7y7ZA
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.