That's a very interesting idea mr phantastic. I do however see a problem in that tapping small thread diameters into copper is fraught with the danger of tap breakage and the lack of resources to remove said broken tap(s) without destroying the block. The deeper the holes (as in these cross-drilled blocks) the more likely one is to breack a tap. #4 and #6 taps are quiet small and easilly broken in steel let alone copper, which is an absolute BITCH to tap. A coarse thread would best.
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