On Sun, 18 Apr 2021 21:01:02 +0000, susanb wrote:

I've been cutting Ostrich & Emu Eggshells. Tried Everything.
First pencil where you want cut. Use a COPING saw to gently make a
shallow cut in egg all around. Then, go around again, going deeper with
each round until egg is cut in half. Will be a little rough, Put med.
grit sandpaper flat and rub shell half over it 'til smooth. Trim will
cover -up flaws.

Use a guillotine.