Outside Mirror Adjustments

Oldme. Can't think my rig is unusual. My large mirrors do have remote control. That said, the lower convex mirror which is part of the entire assembly is manual and I couldn't, for the life of me, adjust it. I was afraid I would break it. My rig manuals gave me the information as to what company manufactured the mirrors and I got their customer service info from their website. I told them what mirror model I had and explained the problem. They emailed me a PDF file on that particular model along with their tips on the easiest way to access the interior, out of sight, screw which needed to be loosened in order to fix the problem. So, OP, maybe you can contact the mirror mfr and get some help from them. Obviously not every Class C rig has the same mirrors and what works for some may not work for others??