you could use a metalworking lathe to shape them then drill a hole in them with a tungsten carbide bit!
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hmm.. just get ball bearings, heat them up till they glow and oxidize, then drill a hole thru them
you could use a metalworking lathe to shape them then drill a hole in them with a tungsten carbide bit!
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hmm.. just get ball bearings, heat them up till they glow and oxidize, then drill a hole thru them
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