Correcting the warp requires radical surgery and great care, if the piece is valuable, think twice before doing it. The repair may cause considerable loss of value in the antique market.
Step 1: Kerfing the Underside Make a series of parallel saw cuts (kerfs) on the back or underside of the warped piece. Use a radial saw to make the cuts about I Vi inches apart. Set the saw to cut about Va inch less than the thickness of the wood. Begin the cuts an inch from one side, and make them all across the piece and for its full length.
Step 2: Removing the Warp Toget rid of the warp, place the piece on a flat surface, with the side with the kerfs in it facing upward. Dampen the wood with a fine spray from a plant sprayer, or use wet cloths. Do not drown the piece, but at the same time be sure that moisture gets down into the kerfs. Then put heavy weights all over the piece and allow it to dry. The hope is that the moisture and the weights will flatten the piece against the surface on which it rests. If at first you do not succeed, try again, using a little more moisture.
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