My passenger side sun visor suffers from an annoying vibration buzz when in the up position. Pressing on the edge facing the seat either limits it or quiets it down completely. Pulling it down at least part of the way muffles it somewhat and pulling it out of the clip holder on the left shuts it up completely.

Suggestions anyone?
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I have put foam tape on the cover so it pushes on the visor when in the closed position.

 

Where specifically?
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Flip the visor down and put thick foam tape on the outside surface of the lid that touches the visor material.