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Spark gap spheres

Original poster: "Jonathan Peakall" <jpeakall@xxxxxxxxxxxx>

Hi All,

I know this has been discussed before, but I don't seem to be able to find
the posts. Anyway, I need some brass or copper spheres, blind tapped with
4/40 or 6/32 thread, 3/8" in diameter. I know someone on the list posted a
link for reasonably priced ones. Anyone got that link handy? US$5 is the
cheapest I have found so far, and I need 20 or so.