Just completing a large dinning room table for a cust. The leaf size is 24" x 36". I have completed the finish on this w/the exception of the 2 final coats of 'table top' & the finish buffing. Now I find that the leaf has warped. It is approx. 1/2" higher in the center. When glueing this up I did alternate the grain pattern. What to do? Can I spring it back into shape by weighting the center? The outside edges are 1-1/2" thick by 5" wide x 24". The inside board is panel 3/4" thick x 26" wide x 24". Panel made up of 6 boards glude together. TIA for the help. Can always make a new leaf but feel that is the last choice.