Raise the right wiper arm up till it stays up. Lift off the black plastic cover where the arm attaches at the cowl. Tighten the nut on the shaft! I think its a 12 mm or 10mm. If the arm just falls over because its so loose then lower it and align the wiper blade to the base of the windshield then tighten nut.

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.