I had my father, who trained as a toolmaker ages ago, help me defret my old lefty Ibanez ATK a while ago, but apparently we screwed up, as there was a lot of buzz all over the fretboard, no matter how high the action. We added about three additional coats of lacquer, but things didn't improve much. Now I was wondering: how much do you think it would cost to have a luthier replace the fingerboard? As my ATK is a lefty, getting a replacement neck is pretty much impossible. What would you do?