I'm changing the window regulator because the motor is shot. This was in the bottom of the door and I have an extra but don't understand how it mounts. Most of the threads deal with the other slide that must be peened onto the regulator.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

I had a 1973 450SEL and the sliding jaw came apart for replacement rather than having to be peened in like my new 1981 300SD. I am wondering if what you have is an earlier sliding jaw? And maybe it does not go with your SD?

Take a look at the bottom picture of step 9. It should explain what you want.
http://www.startekinfo.com/StarTek/outside/12253/program/Chassis/72-185.pdf

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Sam

84 300SD 350K+ miles ( Blue Belle )

That's an excellent link! Wish I had that when my window got stuck down after the audio installers rolled it all the way down. It was odd, in that the window could roll down, but if rolled down all the way, it would not roll back up.

Took apart the whole mechanism, including the motor, which, by the way, is completely serviceable in my 124. That white piece had me stumped for awhile though. The way it was installed when we removed it, didn't seem right. Flipped it around and voila...everything moved smooth as butter.

This PDF would have quite a bit of time!

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1987 300TD
1984 300D
755,000 KM and going strong
BC Canada

It took me a while to figure out. I'm working on an 48SD. The piece goes onto the vertical window channel at the back of the door and then into the lower channel on the window. I cleaned both channels with brake cleaner then applied a very small amount of grease. Too much grease always attracts dirt and eventually clogs things up.

I never did find a really good way to manipulate and hold the window but eventually everything lined up. I'll call Peach & see whether they can get alternatives to what they list currently - OE parts and URO. OE is too expensive.

I expect that part is missing from the other doors because I've never seen it and have had window regulators out. Now onto the next project.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.