After a ride the other day I noticed a tick while pedaling towards the end of my ride, figured maybe I got some junk in my crank. Took the crank apart and BB and found that everything was clean and well greased. Really started looking at my bike and finally found that the real derailler was loose (Shimano XTR). The (mounting bolt?) had loosened from the frame which was causing the derailler to rock. Tightened it back up and everything is fine. My question is has anyone ever used loctite to keep this from happening? If it had come completely off there would have been some serious damage. Thanks!