Bingo.

You can try to work some lubricant into the pivot to try and free it up, but you'll likely be in the same situation not to long after. A couple alternatives would be to either A) get a new arm, and lube it regularly. B) search around here for the thread where a member updated his rear wiper to the all plastic volvo/land rover (IIRC) design. C) Delete it all together....you have two other mirrors to use in the winter.....all the rear wiper does is scratch the glass anyway.

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