Popping off the ventilation grilles?

The round ventilation grilles on the dash of a 71 bus . . . how do you get them off? I have what sounds to be a playing card or a bat or something rattling around down the driver's side vent tube when the Wonderbus is at highway speed. Can't see anything, need to pull the grille and fish around down in there.

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Mike Rocket J. Squirrel Elliot
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