Generally do not use on flight control surfaces. However, have found them to be very reliable if properly installed. Installation method: Place ez conn in item to be attached to. Place flex washer on pin. place on piece of wood, with washer and pin directly on wood. hit top end with hammer driveing pin into wood and through flex washer secureing onto pin. ALMOST impossible to remove even when trying to. If using threaded pin type, definitly use thin CA on nut.