I installed my Ground Controls today, and the rear are making a ton of noise. When you push down on the rear, the bolt on the top of the shaft moves up and down. Here's my order of parts installed: top nut, gold washer, rubber grommet, top hat, Ground Control top, spring, bottom perch. Am I missing something? I looked on Sentra.net, but they installed Motivational upper hats, so I can't go by that picture. The one thing I did notice was the rubber piece between the Motivational hat and the GC top part.