Hello. I have a '71 280SE w108. It's in pretty good condition overall, but I do have one small problem with it: the driver's door does not stay open, like the rest of the doors do. When it opens, it opens smoothly, without the catch-stop-things that keep it open at certain points. If you leave the door open, it closes itself on its own.
While this might not really seem like that much of a problem, it sort of is, because, if, for instance, you open the door, put your leg out, then reach over to the passenger's seat to grab something, the door comes back and whacks your shins! Not fun.
So, I'm wondering, before I do anything, which part's breakage would cause this? And, would it be very easy to fix, or would it be too much trouble to fix it? I apologize for my limited vocabulary; I really don't know what some of these things are called