Here's another one I use when I need to do a lot of frog stitches. A fish fillet board. It's long, and has a good grip clip. The fabric can be clipped to the board, a foot can hold the board steady while the fabric is gently pulled with one hand, and the ripper, or craft knife, is used in the other hand. About 6 bucks in the fishing dept of WalMart. I began using the board for macrame, but it's a great 3rd hand for many things.