Especially if you fill the dimples with a green paint pen (the youngsters probably won't get this reference).I don't know what the dimples mean but am told by some hifi audiophiles that they sound better than the non dimpled varieties.
No, I'm afraid not metric. These are #6-32.
Cool, thanks. That explains the dimples I've seen so many times in Japanese equipment I've repaired.
However, trying to follow that lead hasn't given useful results yet, so still a mystery.
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