So in my drivers door there is a banging when I go down the road. I took the door apart and felt inside and I can grab a loose bar on the regulator. It flops about 1/2" or so, but it's enough to make a loud banging going down the road. I thought about taking the regulator out, but I don't really want to mess with that pop-rivet to do it. Anybody ever seen this or know what it is, or is there a way to remove it without risking damage to the window?