I was referred here by someone at Cordoba Music Group, as they don't have this info. I've got a client's 1978 Guild D-50 N.T. on the bench for a whole slew of work (bridge reset, neck reset, refret, setup, the whole nine!), and I simply cannot find what the original fretboard radius was. Measuring isn't helping, as the fretboard is heavily worn. Some areas suggest 12", some 14", and some 16". Please help me, I'm coming up with absolutely nothing.