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I took a short piece of 1/8”x5/8” brass bar stock, squared it up and milled it to size, then drilled the six clearance holes. I was careful to carry forward my transposed measurement for the center holes (it was supposed to be 0.531”, but I faithfully drilled it at 0.513” on the cylinder and the steam chest!).
It looks like you were pleased with the Flexihone. I have been aware of them for many years and have heard mixed reports but never actually tried one. I went in the direction of Acrolaps.
Nice job Kim especially single pointing the 10-32 thread. Single point threading is my favorite machining operation. There is just something about watching the thread form with each pass.-Bob