Even the most carefully edge-glued panel can warp slightly, but you can pull it back into shape during assembly. In the example shown, a side panel warped inward near the top. To straighten it, the side panel was screwed in place at the bottom while leaving a gap at the top between the panel and the spacer. The panel was then pulled snug against the spacer and the second screw was driven in. The remaining screws were driven in until the panel fit tightly against the spacer at the top.—from the WOOD® shop