Now to add relief into the equation - if you have a lot of relief, the middle frets will have to stretch proportionately farther than the frets above and below the relief curve in the neck. The only way to accommodate that is to design in the relief, lock it in with a theoretically stiff neck, and move the fret positions to idealized locations. I hope no one takes this seriously, but it's true.... 
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Brian Evans
Around 15 archtops, electrics, resonators, a lap steel, a uke, a mandolin, some I made, some I bought, some kinda showed up and wouldn't leave. Tatamagouche Nova Scotia.
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