Doing it by hand with sandpaper is a nonstarter.
Also I don’t have a lathe :-/

  • Ugly Bob
    link
    41 year ago

    You don’t want the whole hemispherical cup. Just a semi circle.

    The best and traditional tool for the job is a rasp. I recommend a Shinto rasp. Surprisingly fast and easy to use.

    • The_Pete
      link
      21 year ago

      can confirm, I have a rasp (Shinto) and I can throw a 1/4 or 3/8 quarter round on an 8 foot edge before you can get your router set up.