The one that I had experience like this on is the '83 240D I sold my neice. I ended up just pushing the check rod all the way in. The piece that the pin goes into is down in the jamb somewhere. You can run it like this but you just have to be careful opening the door in a strong tail wind. On one car I saw that had issues in this area was a 400k mile 300SD and the jamb around where the pin holder goes had some pretty severe cracks.

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Jim