I was having a problem with my 83 240D electric side mirror in that it went side to side, but not up and down. Various people have said, oh set it by pushing the mirror where you want it and leave it. That will work, but my goal is to restore this car for it's been in the family for the past 25 years. and I want that factory ride. I've driven POS's for most of my life so in my older age, and while I can still move around and do work, I wanted something comfortable to drive. The brakes came first and the rear springs got replaced a few months ago. Attention turned to interior of the car and I wanted to make the side mirror work by the switch. Recently my son and I took a trip which covered considerable distance and the mirror seat and mirror kept changing between my son's driving habits and mine.
Since I've already done this job, a forum member recommended that I create a thread on the subject for others would like to know. So here goes