If you use any Loctite I would recommend no. 609 retaining compound. If you put a flywheel on with that, it's not coming off. Ever! The ball is nylon though, so I'm not sure.
If you go to smallparts.com, Stock Drive, SDP/SI, or even NWSL, you might be able to find a metal horned ball with the same dimensions and inside diameter that will press onto the shaft. Affix it with Loctite 609, and it's a permanent solution for you and LionDrive owners everywhere!