Cutting mortises for hinges is something I usually do with my handheld router and a chisel. But when I needed to quickly cut mortises on the edge of some doors, I built the adjustable jig for the table saw that you see above. Miter Gauge Extension. The jig is a plywood miter gauge fence with a T-track recessed in it. A pair of stop blocks that ride in the T-track set the start and stop positions of the mortises. By using a rip blade in the table saw, I can make a cut with the workpiece against each stop, then nibble away the waste in between. Then, I flip the workpiece around to cut the second hinge location.