I understand that the zero fret is supposed to set action while the nut sets string position. My question is: do you really just set a fret at the "0" position? Wouldn't that result in fret buzz because the strings are directly on the fret?
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The point is that the fret is optimally going to be as low as all the other frets. When you fret a note, does the string rattle against the higher frets? They're not supposed to. The action of a regular with a capo illustrates how a zero fret works, actually.
I guess I'm just not picturing it with enough tension in my head. Hmmmm...let me imagine harder...
Yeah, I think I get it. So, from a luthier's perspective, you make the nut lower and farther back than normal with an angled headstock or string retention bar, then you put a fret in just as you would any other fret where the nut would normally be and...that is all there is to it?