Foolproof Tenons Two blades and a rock-solid jig guarantee success. By Tom Caspar Mortise and tenon joinery is the heart of many classic furniture projects. It’s an incredibly strong, time-tested method of connecting boards. Making these precisely fit joints can be fussy and demanding work. But it doesn’t have to be. There are at least a dozen ways to cut tenons.We’ve chosen a technique that delivers the goods every time, …