I did the same thing tap and clean it out try a longer bolt but make sure its not too long but can catch some of the unstripped thread that loctite thread repair 2 part epoxy has worked nice for me use loctite blue and dont torque it hard just snug make sure the matchining mating surface and key on the crank and balancer isnt catching and binding and use lube mine has stayed on but i hate to see fly off QQ