The pins break on the plastic clevis's. It happened to me on a preflight. I grabed the elevator and gave it a wiggle, then it was free. Would have been bad had it broke in flight. Mostly a problem with age and wear and tear. Saw a buddy lose a 40 sized corsair. Beautiful dive from about 250' at 45deg angle straight into the ground. Broke elevator pin was cause of the crash. At least replace them on the elevator. I've never had a rudder or aileron problem with them, but they dont see as much stress as the rudder. They would probably be ok on 40 or smaller sized planes that are not high stress flyers, (quicky type flying). I only use them on throttle or other low stress area, definately not on a flight surface.