it is a good idea to check your derailleur hanger bolt as well- mine dropped off and I only noticed it when I was serivicing the drive train and I took the rear wheel off and the derailleur fell off the bike and was dangling by the chain. I loctited the new one on and check it every so often.
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only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)