A deceptively simple-looking tool, the BoWrench is a boon for both professional deck builders and do-it-yourselfers. The BoWench gives you a fast, one-person way to straighten decking boards. This is great, because decking material–whether redwood, cedar, or another, more exotic rot-resistant wood–is often warped, especially in 14- to 16-foot lengths. To operate the BoWrench, you simply fit the tool on a joist, swing the lever arm, and...