W140 - electric wing mirrors

[pshawfocus]

I managed to knock the near-side wing mirror on a lamp post and disconnet it from the folding mechanism. The sits almost flush if you push it back but I need to reconnect it. Does anyone have a guide on how to re-attach the mirror section with the half moon motor drive? There's a single screw which attaches the mirror to the device which rotates to fold the mirror. That screw has been bent and pulled from the rotating plastic half moon. I can't remove the screw due to the bottom of the wing mirror casing. Is there a way to remove the mirror casing?

Thanks in advance

Gary