One other thing to consider, the plugs will lose some weight (about 0.1-0.2 tenths of an ounce as they dry)...then again they gain weight when you epoxy them. Usually it all comes out about the same.
Take the plug you are trying to copy, weigh it, then weigh the equivalent of the hardware it is carrying and subtract. That will be close to the weight you want your plug to weigh when it comes wet out of the sealer.
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