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I make my weight molds out of 1x3 red oak from the depot.
I make a top that acts like the gate and the bottom is the mold.
See pic.
Clamp it all together first and drill the holes for the pins. Remove the top and use a counter sink bit for the well. Drill the mold hole. Use pins in the molds to align the top and attach the top. A couple of nails used as alignment pins help.
Clamp together, insert pins and pour quickly. That neck that the gate makes makes it easy to break off the extra. The wide deep well gives you time to stop the pour. The come out nice and uniform in size and weight.
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