Hi folks, sorry if this has already been asked, I did search the archives but couldn't find the answer!

I've just bought Sonia Cheadle's stone setting book, and have a first attempt at a claw setting pickling as we speak, but what I'm most interested in is cutting the little notches for claws and carving bearer shelves for rubovers. I had a look in the Cookie shop, but there's so many, I don't know where to start! I figured that cutting into chenier would require a burr exactly the size of the stone, but what size would I need just for notches and carving?

Thanks, here's hoping for some enlightenment...