In recent months, I've been plagued with the shift lever coming loose on the transmission selector shaft, on my old dirt bike, making gear changes unreliable and sometimes impossible! I just had the engine re-built and I'd like to use it! Re-tightening the bolt on the shift lever has only helped temporarily. Recently, I tried using an application of Loctite on the shifter bolt and also between the shifter and transmission shaft, which resolved the problem, but again only temporarily. Desperate, I've even considered a spot weld to hold the shifter on the selector, but that's not feasible as the selector shaft is steel and the shifter is aluminum. Maybe a dose of epoxy steel filler, between the shifter and transmission shaft might do the trick....?? Thoughts?