The OP double posted it in the build and repair forum same day he posted it here, and got some answers there. You get a protractor and use the side of the guitar beside the neck joint as the reference angle, and measure the relative angle of the bottom of the fretboard to see what the neck angle is. On an archtop, it will be in the range of 3.5 degrees to 5.5 degrees, depending on things like height of arch in the top, floating or fixed fretboard extension, desired bridge height.
https://www.acousticguitarforum.com/...d.php?t=568709
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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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