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Go to a "Big Box" store and buy 4 expansion well nuts. They're about $1.50 each and will solve your problem.
BTW: The problem you're experiencing isn't unique to DRV. It's quite common. The washer is in place to keep the grate from "rattling".
I bought a half-dozen well nuts (2 spares) that were the same diameter as the hole for the existing washer and they did the trick.
Hope this helps.
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