Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> McMaster-Carr in Chicago. They carry brass which works good and not as expensive as pure copper. Dr. Resonance -at-easternvoltageresearch-dot-com> > > Anyone have a source for copper hardware (in particular i'm looking for > 1/4-20 thread machine screws) > > Thanks > Dan > > >