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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…
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.