I’m building a split-top Roubo workbench. The top is hard maple, consisting of strips about 6 ft. long x 2 in. wide x 2.5 in. thick glued up butcher block style to form 2 slabs, each about 12 in. wide. I glued up the top first and then built the base. The top pieces are mortised on the underside to fit onto tenons on the top of each leg, and then will be screwed to the rails with lag screws up through the end rails. But now I find that there is twist in one of the top maple slabs. If I push down on one corner, the diagonal corner on the other end pops up about 1/8 in. What approach would be best to remedy the twist in such a large and heavy piece? Should I should be looking to flatten the underside of the piece so it will sit level? I am also concerned about losing too much thickness in the slab with any fix I undertake; I wouldn’t want to lose more than 1/4 in. at most. The fixes I have read about include ripping it into 2-3 pieces, then squaring up each of them and re-glueing. Or putting the slab on a sled, shimming the uneven corners and sending it through a planer or drum sander. I’m uncertain how I would go about trying to remove the twist with a hand plane. Ideas? Thanks.
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