Doing it by hand with sandpaper is a nonstarter.
Also I don't have a lathe :-/
this post was submitted on 16 Jun 2023
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I've actually tried this! The problem is that the sandpaper is too thick to bend neatly in that tight a radius. Maybe I could buy raw grit and stick it in the cavity with spray adhesive....
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.