Has this ever happened to anyone else? I was cruising along and my seat shifted forward (I guess it lossened up from between the brackets holding it in place), and then the next thing I know the bolt snaps and the bracks falls away leaving me with a seat falling down between my legs. I lost the bracket because I was riding a metal gated pedestrian bridge over a river, and it fell through. My LBS gave me a replacement bracket for free from their parts box, but didn't have a bolt that worked, and neither did my local hardware store. Where/how is the best way to get a simple replacement part like such other than what I have tried?