The mirror is more than likely Velvac. After extensive research their the only company I have found that make MH mirror.
Towards the bottom of the mirror is a little cover using a med size screwdriver remove cover. Using a hex wrench AKA Allen wrench, olden screws adjust mirror re tighten hex screw. Do not attempt to adjust mirror without loosening set screw, it was an expesive fix.
2019 Entegra, Aspire 44r. Former coach 2010 Fleetwood Discovery, Cummins ISB 350, 2016 Jeep Rubicon or 2005 Jeep Rubicon.