Mirror moves on its own
I just completed my "shakedown" trip in my 98 HR Endeavor in prep for going FT this summer. During the trip, when we hit rough road, the right side mirror arm would move inward on its own. I would compensate by adjusting the glass, but it eventually would get to the point where I was looking at the side of the coach. We'd pull over, move the mirror in and start the process over again.
The hex nut that is supposed to control the arm is not loose, in fact, its frozen. Any ideas on how to approach this without a trip to the shop?