Electric window lifter stop mounting bolt
1. Remove the interior door trim panel and polyethylene apron.
2. Lower the window and disconnect the wire from the negative terminal of the battery.
3. Unscrew the bolts securing the window regulator guides to the grooves.
4. Lift the glass and support it with a wooden block.
5. Mark the position of the electric drive wires and disconnect them from the terminals.
6. On the rear door, unscrew the fasteners of the rear glass guide channel and move the channel forward.
7. Loosen the mounting bolts and nuts and remove the window lifter together with the electric drive through the door frame window.
8. Install in the reverse order of removal. In this case, if necessary, you can adjust the glass lowering stroke by loosening the mounting bolt and changing the position of the stop on the window lifter lever.
Material borrowed from an online resource mercedesman.ru