The Bo-Wrench is a simple to use tool that is great for both professional deck builders and also for those who want to do it themselves. You simply fit the gripper onto a joist, swing the lever and release. This tool is great for warped wood especially at longer length. The Bo-Wrench is a fast, one-person, board-straightening tool. 

Basic tool binds itself to any 2x (1-1/2") joist.
Frees up hands and legs
Seconds to operate
Gripper swivels for angled decking
Interchangeable parts for pushing or pulling
Bends multiple boards
Closes gaps up to 2-1/4" +
Left or right handedSimple to operate
Powerful mechanical advantage
All heavy coated steel construction
Bends 3/4", 1x, 2x6, etc.