I put hard bushings on my trucks, but since they were too big for my low trucks, I sanded them down a bit. Should have sanded more, but I really wanted to go out in the sunshine, so I just left them as loose as I could and went to town. Big mistake. The back nut was too loose and it dropped somewhere. When I stepped off my board and popped it up, the back truck went flying, alongside a bunch of parts. I could only find bottom bushing and washer, and the truck proper. Good thing I had spares. So now I finished the job properly, or at least I hope so.