That kid has the whole world in his hand, huh. Well, you and I know there's lots of them, worlds, that is. This one has four corners, spins round, and there's this diamond disk that goes back and forth overhead. That grinder mounted 9" wheel is the biggest you got, so I guess it never occulted to you that after you glued the cob back together you could slice it, replace the kerf with a disk of calcite, rinse, and repeat. A little of that diddly carving you and the kid think so much of, and done. Hate to say it, but we made fireplaces faster.