Securing round objects

I had an idea to carve into a round object. Does anyone have any ideas on how to secure such an object?

Google search V block.

Double sided tape, or I have seen some clamps that clamp from the sides and put pressure on the object being carved.

Just realized you meant cylindrical object, not a circle…

I actually just had the idea of making my own, low profile v block then using an old adjustable strap with rivet holes in it that I can secure to the holes in the waste board. Not sure how well it will work out.