Don't do this
Jeremy Osner
>When you are trying to flatten a board with bow in it, and it is taking a lot of effort to produce no progress, you may be tempted to try and resaw some of the bow out freehand. My advice to you is, to resist this temptation. It will just cause you to sink hours of sweat into making your board unusable. A better idea is, you should find another board that does not have any bow; use the bowe one for something where you can cut it into short pieces.