The steps may be somewhat the same as I have dismantled several mirrors this month. I have a W126 that has a manual drivers door mirror.
Really annoying.
I have the parts needed now to make my mirror a true remote.
What I was doing taking apart the mirrors was to see if the motors in the passenger mirror would in fact fit the driver side. They do.

With the W126 mirror I angled the glass inward as far as possible. Using a long pair of needle nose pliers and a small flat head screw driver I was able to disengage a circular wire that holds the glass to the body of the mirror.

Practicing on a junk car gave me the courage to proceed on my own.

After the wire is disengaged and the glass is removed, you have full access to the motors.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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