Originally Posted by corners
I'm thinking of squirting something into the grommet holes. Travlerajm has done it with silicone but I don't think that will be dense enough for this project. Researching other materials.
Maybe a combination of liquid and lead tape. Squirt the silicone and measure the mass gained. Then add the remaining mass with layers of lead tape.
Before you attempt to beat the odds, be sure you can survive the odds beating you.