Mike the pads on the 1800 only have one pin going through them, what holds the top of the pad I have no idea but that was where the failure occurred.I've never seen it happen on a wing, but it is not uncommon to lose the retainer clip and pin. I don't know if it's gremlins, or poor workmanship by the previous installer, but it does happen. I was in the service dept of a local Honda shop recently, and they were feverishly looking for a pin for the crotch rocket on the lift.