Years ago I was looking at old airplane pictures (as one does) and I came across a shot of a control panel that was finished with an overlapped circle burnishing pattern, and I fell in love with the look. I think I want to try again with a larger bit for bigger circles, but the general idea is there.
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We call that treatment "engine turned" in the auto business. It was a popular option for mounting accessory gauges back in the '60s.