so ive got a serious problem and im not sure what to do about it.
a while back i put on some FSA vigorelli cranks on my bike with a new fsa platinum pro bb. now after a few miles the bolt that holds the crank onto the bottom bracket spindle loosens and starts to creak. did i do somthing wrong when i installed them? the cranks were used when i bought them but they werent in really bad shape. are these things toast?