I found a solution for the Seat Adjustment Pins when they get loose and almost fall out. I took a rubber cap that the automotive industry caps off vacumn hose fittings with and pushed it over the ball end of the pin. They are available at most automotive stores. Just push the rubber cap over the end of the pins where the little ball is and they keep the pins in the holes. I had trouble with the pins backing out and almost coming out. I looked at my wifes after our last 12 mile ride and her pins were just about to fall out so I put the caps on her's also. Just one way to make sure the pins stay in place. If you ride on some bumpy paved roads or bumpy dirt then the pins have a tendency to bounce inside the holes and work themselves almost out, I haven't lost one yet but am sure I would lose one if I didn't apply this fix. Just a thought to share on an item that could get lost while riding. Good luck and keep trikeing.