Thanks. There's a youtube video where a guy dose on on a w116, it looks to be pretty much the same process as the w123. I just wasn't sure about access to the bottom lip, sounds fairly straight forward.

I'll have to do it on a day where I have more patience than usual. This coming friday I'm taking a week off to help someone deliver a boat, so maybe after a slow trip at sea I'll be in the right mood to pick away at something tedious.

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1984 300TD -- summer daily driver
Many others that aren't Mercedes...