right, that's the hex key piece that lets the wheel move the slats. the one that I could not get the angle of it and the piece in back of the vent housing that it attaches to (which is on a little swivel so it can go up and down) to line up right. that looks like the bulb too.

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car