Hi Smelmechiz,
Yes make sure the body is done up tight on the shaft and then slowly operate the recoil starter rope to turn the engine over and note whether the body outer edge moves left and right while rotating. If it does don't bother going any further with that body, just remove the thrust bearing and hang on to it. Then either discard the old body or send it off to be properly line bored and sleeved, this way it'll be able to be used again as 5/8 bodies are currently not available to purchase anywhere as the supplier into the country is having big issues getting them, ofcourse they are all now made in China........where else ?
Cheers,
BB.
