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Mike, I think the old bowling balls (pre polyester) were made of phenolic resin, like old telephones and radio Knobs. Phenolic is pretty tuff stuff, but a bit more brittle than Delrin I expect. Is not Micarta phenolic resin impregnated fiber, at least the original name brand material? MSC has several different tool room plastics in their catalog. Some of them sound very exotic, and so far don't show up in hand made knives, but that is probably because they are butt ugly.
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