Italian threaded BBs are always prone to this because the left cup unwinds in the same direction as the crank rotates so in time, they will always come loose whatever you do. This is inherent in the design. You've done all the right things, not sure what else there is to stop it recurring.
Italian threaded BBs are always prone to this because the left cup unwinds in the same direction as the crank rotates so in time, they will always come loose whatever you do. This is inherent in the design. You've done all the right things, not sure what else there is to stop it recurring.