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I have the same problem, you could barely hear my 86 300 E , my 94 E320 it is very annoying. You can lube the shaft and the rollers from the outside, yet the results are marginal. I am in the process of changing the base molding on the windshield, and have to take the wiper and the motor off. This seems to be a nightmare.
Engineered like no other car in the world!! I cant belive that this whole mechanism, albeit great to watch during operation, really has no clear advantage. Plus you dont have a backup, hence the bullet proof and therefore noisy design.
Anyway I will let you know what it looks like once I have it apart.
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Regards
Mino Erhan Dallas, TX
'97 SL500 40th A.E.
'97 S320
'01 ML320
'85 Peugeot 505 SW
'07 BMW R1200RT
'74 Suzuki GT750
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