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I have been taking a couple of pieces of old 1X2 scrap wood, clamping them together and the using the drill press to drill holes that right down the middle between both pieces.
When I work on a prototype I drill a bunch of holes of different depths to get different weights to see which works.
Once you know which length you want, drill 5 or 6 holes to that depth and pour away. I was just using some old waste 1X2 pine and it held up thru 4 pourings ok. Once the lead solidifes I unclamp them and pop em out of the mold and start over.
I use the same diameter bit for my weights as I use for my belly grommets so when I'm drilling the plug all the belly holes are the same diameter.
I don't have a duplicator so I make plugs in runs of 12 or less. I keep one Master and the weight that goes with it, and put it a side so I can make more of them later...
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