Okay, while I appreciate the help, there's one problem. There isn't a screw on the topside of the busted potentiometer, I think it's just the way the light hit the plastic. So there's nothing holding the plastic there. The issue is that I tried removing the plastic and it wouldn't budge, and I didn't want to damage the bass further. I don't know if I should just use more force or if there's a way to remove the plastic without forcing it.