As mentioned in earlier posts...today while installing my new pedals I managed to stripe my crank arm...ie the pedal won't stay on. My question is can (or should I) buy a new crank arm or look for a whole new crank set. The one's on are TruVativ ISOFlow 3.0 175mm (22/32/42). Does the replacement have to be exact specs or just make sure it's compatible w/BB (Power Spline)? Appreciate any help....and yes I know I'm a moron!!!!