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On the assumption (I know) that the noise comes from a vortex street shedding off the body of the mirror maybe a solution could be found with tiny vortex generators or wickerbills on the mirror itself.
What does BMW's fin look like?
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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