9.5" Radius Fretboard Sanding Block

thingiverse

Smooth out that rough wood with a strip of sandpaper to precision-shape the fretboard of your axe, whether it's a six-string or a thumpin' four-string bass, down to a silky smooth 9.5-inch radius. I put this technique to the test when converting a bass neck to a slick-fretless wonder.