First, I worked with wood for a bunch of years, and then I did some research on why the warp happens and compared it to the situation I found the top in, leaning against a door in an old farmhouse with a broken window. Other parts collapsed on it bending (warping it) and it got damp for a number of years too. I was lucky that it did not rot. I took it to the h.s. shop, and as luck would have it, the dimensions were perfect to pay it as a diamond on the work bench, and then I clamped it with four Jorgenson clamps with the roof upside down, so I could lay a wet towel on the warped part which dampens and relaxes the wood fibers allowing them to stretch. This took two nights to get it back and then it was perfect. I was lucky! It was warped a good seven inches. I was surprised on the third morning when I removed the clamps, turned it right side up, and it laid perfectly on the work surface.
