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foam toroids



Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 

Rather than fool with trying fill innertubes with relatively expensive foam
in a can..

Buy big blocks of expanded polystyrene (trade name styrofoam), and use
either a hot wire (best results) or an electric carving knife and a template
to make a toroidal foam block.  Sand, "bondo", cover with your preferred
conductive surface.