I am the new owner of a very nice '91 300SEL. It has 135,000 miles and is in great shape except...the wipers hit the rubber windshield surround on the left and thump into the well to the right. I have read the wiper threads, having done a search, does anybody know how I can fix this? The car is virtually silent except for the whack! thump! of the wipers flailing back and forth. The blades and cages appear to be OEM, the blades are marked (in German) L and R and appear to be installed correctly. They have the little tabs. Am I looking at new linkage or bushings or....?

I am currently doing research on service manuals and haven't yet bought one, so I am throwing myself on your mercy.

I have another one too but I'll start another thread.