General Tools & Instruments Tru-edger Jointer Clamp Kit
The clamps mount to a guide board (made of scrap) to create a flat reference edge
Now, you can straight-line rip crooked boards using your table saw, just attach your crooked board to a piece of straight stock using the Jointer Clamps and run the stock along the rip fence to rip the crooked board
The Jointer Clamps works in two easy passes and is great for use with long stock

