If it is similar to my 1987 300D Turbo (W124, OM603) -- and I don't know that it is -- the pod's arm is attached to the flap by an expanding plastic pivot point. There is no pin, clip, or fastener to remove, you just (carefully) lever the two parts apart using a thin-blade screwdriver.
For a picture, search for Sixto's thread "87 300D recirc and defrost pod replacement" and scroll down to picture #13.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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