I'm not posting this as a rip on the OP, I just think the pic is great!
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View attachment 405231
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Thats a more accurate way than the 25.4mm one. Not that it's a big difference but when your machining it can make a difference lol.
That's backwards. 1 inch = 25.4mm exactly. Using this conversion is more accurate. You are rounding when using the inverse, 1mm = .0394 inches. Actually, 1mm = 0.0393700787401574803..... inches.