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

  • Ugly Bob@lemmy.world
    link
    fedilink
    arrow-up
    1
    ·
    1 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.