Use Loctite 603, as it works to hold even in an oil bath. I used it to hold a gear on the shaft when I could not get the right gear on the discontinued gearbox from SEW, and the only gears they had that were the right match were for the upgraded box with a 2mm larger idler shaft. A bit of work with some tinsnips, a piece of convenient galvanised steel, a file and a hammer and the loctite 603 and that gear was a permanent part of the shaft, swimming in the Gengear 320. Was a little noisy, but with the rest of the machine being so much louder you could not hear it. I really wanted to get rid of that Varimot, so the next upgrade was the new end bell, a variable speed drive and half a motor.