I have 2 issues with my windows: 1) The power motors (fronts) are going bad, slowly. I've never replaced a window motor before and want to do these. Are these things secured with rivets? What's up with that? What's the story with replacing these? 2) The wind wing (great invention) are so tight it's nearly impossible to move them. I tried pulling the panel off and loosening the nut while holding the other nut and nothing seemed to happen.