You really don't need one. There are some radius gages you can print online (or draw with free CAD), then tape to card stock or Masonite and cut out. A sharp plane and long straight sanding board should be all you need. I still don't use radius blocks when hand-shaping a fretboard! Besides, since the fretboard is tapered in width, no radius sanding block will give you a true "flat" under each string.
|