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on the subject of balance weights, uranium would be nice (specific gravity -
18.5), lead is cheap (sg 11.3), but tungsten (sg 19.3) is denser, stronger,
available and used as a counter weight in low drag aircraft (nemesis). some
tungsten carbide plants will sometimes sell (or give away - it's a hazard)
"dirty" tungsten at a reasonable price (make sure it's not tungsten
"carbide", it weighs less ~ sg 14.5). I got my (old) powder free.

Scott