when visors dont stay up like i think they once did...what part is old and neds replacing, the little extension that fits into the slot, or the placstic slot piece, or does it ever get fixed? 1984 380sl
How is it falling down?
There's the plastic tab on the visor and slot in the post above the window. You can buy new sets for this for $50 or so. I don't remember where I've seen them, but I have. If I can find it when I get home, I'll post it. Or you can search e-Bay for them.
There's the visor staying swiveled in the position you want, and there's no part to replace for that. There's a screw on the visor that you tighten down until you get a good amount of friction holding the visor up or down.
Then there's the ball that the whole visor swings from, and there's no part to replace for that, either. There's a screw behind the big ball that you tighten (and it doesn't hurt to lubricate the assembly while you're in there). To remove the visor and get to the screw, just remove the rear view mirror by grabbing it and pulling it off. Undo the three screws you'll find holding the metal base in, then find the other screws holding the outside of that upper trim piece. 5 screws in all, and both passenger and driver side trim comes off. Then you'll be able to see the two screws holding the visors in place. Remove them and the visor falls off. On the back of each visor is a screw that will tighten the pivot ball.