I've got a burned out headlamp on my '92 500e - easy to fix I figure so I open the hood and look - air intake (?) behind headlamp assembly, little twisty thing on top that looks like a release of some sort. OK, I check the manual. Very nice drawing of the assembly and how to change the bulb in the assembly but no tip on how to expose it. Remembering how my plumbing skills frequently make little leaks into big ones, I decided to not try random disassembly. Please give me a clue as to how to expose the assembly. Thanks!!!

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1992 Black 500e
1991 Black 300te 4m
1992 Black Renntech 620sl
1979 Porsche 911sc targa