It doesn't weigh a thing--the vibrating is the metal bracket that holds the transmitter to the car. On my car, a few turns of the bolt fixed the rattle. However, I didn't want to ever have to pull the deck out again so I put that small barrier to insulate the two pieces of metal from each other.
If two pieces of metal aren't completely tight to one another, you're gonna have a bad (noisy) time.
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