Well, got the wiper motor out of the car and there is a link that connects the two wiper shafts - the bushings are worn out and are preventing the adjuster from being able to do anything. Need a new link or a new transmission.

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1991 300 SEL
218,000 Km

"Xsbank's rules of mechanical intervention: Always go for the easiest solution first; 90% of what ails a gasoline engine is ignition; After that its all a WAG."