Iodyn

Had similar problem. In my case it seems the adjustable (Hood stops?) on both sides were not extended out far enough. No marks from contact in evidence. I extended them just enough to make contact when the hood was closed -- end of my problem. Might work for you.

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They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety. Benjamin Franklin, A.D. 1759

Roger
1975 240D
1986 560SL