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Have you tried tightening the nut that holds the wiper to the motor shaft? Most times than others, the nut comes loose sometimes, especially when winter comes, and people try to move the wiper blades when they are either frozen to the windshield, or there is a ton of snow on the windshield. Other than that, I would just recommend you to take out the motor and inspect it first had. As far as taking it out, I am not sure how difficult it is, but maybe some one else can help out with that?
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