I have a different car, and four years later, but FWIW my monowiper has nuts up under the "lip" below the windshield. If I lean in and look up under there, I see them. There is a bolt in a little white bracket below the mechanism, and the one I think you are describing on the place that turns around to move the wiper back and forth. I just had mine off yesterday. The big thing I learned was to be careful of those nuts as they come off, they're easy to lose. A flexible, magnetic pickup tool saved me about several times.

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