I was in there for a couple of things.
One was a broken piece of plastic - the glass is held in with a plastic ball joint, and this would probably be the only point I would be worried about breaking when disassembling. Mine did this step for me, the ball broke and the mirror fell out driving...
I can’t speak to the 70 mirrors, but for 62 mirrors, it’s all metal connections. The black metal frame goes into the hinge part of the mirror, and screws to a metal plate on the base.