You mean you have an original service manual? Oh man that is the greatest way to get in the nostalgia groove! I have a reprint. I wanted to find an original that had some grease on it. Typically the photo's are much better and the history is pressed in. Having the OG manual or even a reprint that my Dad purchased would just keep me grinning!
A Mechanical Engineer must tear down his own engine, there must be a law somewhere about that. I am now quite confident that you will have no problem tearing it down and determining what went wrong. For a stand, you will have a tough time beating this price on the link below, on a stand with 4 casters instead of 3. I would always try to stick to a 4 caster stand. A 3 will also work for you but don't pay more than $50 for it. Usually you can find a used one for pretty cheap. The little motor isn't that heavy.
All that aside, you will note in the service manual they tear it down on a work bench. An engine stand is much easier however. You should be able to rent an engine hoist fairly cheap. Make sure you have the motor ready to come out before you rent it. To transport to the shop you may want to go there and ask them for an engine pallet to bring the motor to them. If you find a shop that is warm and accommodating, they should be happy to help you get the motor to them.
https://www.harborfreight.com/search?q=Engine%20Stand