Ed, there are several ways to reverse turn bowls. One way is to use large aluminum discs with rubber buttons for jaws to grip the outside rim of the bowl. These jaws are called Cole jaws and are available in a variety of sizes. Several of the dedicated bowl turners have constructed vacuum chucks which allow you to grip a bowl using a vacuum. I will let one of them address that issue for you as I do not have one. I think you can find several threads on the Creek about vacuum chucks.Originally Posted by Edward E Wilson Jr