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UHMW, or "ultra high molecular weight" polyethelyene. Sort of a poor man's teflon. And the correct way to make bushings is with a lathe; you'll achieve far tighter tolerances and a superior surface finish which is usually critical in a bushing application.
Delrin is an excellent choice for prototype turned parts as it is very free machining, dimensionally stable, and very hard. But, it will have no give and it may not be especially slippery for a bushing application. Thom is right...try McMaster Carr first.
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'84 Carrera Coupe
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