Stipping bolts upon *removing* them?
I've had this happen 3 times to me over the past few years...beginning to wonder if it's something I'm doing or if I'm just unlucky. 2 times it has been on bolts I did not install originally (one seatpost binder bolt, one front derailer cable binder bolt...different bikes); once on a bolt I did (front derailer cable binder bolt, yet a different bike, but suspicious!). Can overtightening cause it, only to reveal the damage once removed? Also in all cases the area in question has been very dirty/gritty which I thought was suspicious. Would attempting to clean before removal have prevented it? Anybody else experience this? Ideas?