Sorry, I've been away for a while..but here's what happened.
On the 93 500SEL, I was locking the door with the key (instead of the button on the key remote) and in turning the key, something broke inside. Now the key just turns freely, without locking the doors. The passenger side lock is fine, and the door still locks with the remote.
I am able to do all the disassembly work of the door panel and lock (I've done many stuck windows). But once I get there, what should I look for. And possibly, is this a part that I can get through Part Shop.
Thanks for the help. Now I have something to do this weekend.
-Apine CD changer