My passenger seat, the actual seat bottom, is loose. Whenever someone is sitting in the seat and I make a turn, it pops. When I grab the bottom of the seat and push and pull up and down, there is a bar that goes across with two u-looking clamps and that seems to be where the noise is coming from. The picture attached is what you see when you look under the seat and you'll see those two clamps with the bar going through. It looks like the only way to tighten those clamps is to take the seat cover off but when I did, I couldn't find the right bit to tighten. I thought it was an allen wrench but it didn't fit. Anyone have a solution or suggestion? Thanks in advance!