2.546mm

It's not just a matter of measuring a very fine, precise distance - you then have to cut a slot in exactly the right place. Try it, it's great fun!

When I do it (rarely, nowadays) I just kid myself that I can measure and cut, by eye, to a quarter of a millimetre, and the result is always good enough for my purposes.

John Colter
 
So 2.546mm is 0.100236 inches.

Does precision beyond 1/1000" really matter? The kerf of your saw blade will be wider than that.
 
So 2.546mm is 0.100236 inches.

Does precision beyond 1/1000" really matter? The kerf of your saw blade will be wider than that.

I can't imagine .001 making a difference in the sound of a ukulele. The idea is to have the fret centered at that point, so the width of the blade/fret doesn't matter.
 
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