Join the leaves to the top by installing rule-joint hinges on the underside of the pieces. Set the top and leaves face down on a work surface, then mark lines along the edges of the top in line with the start of each round-over cut, known as the fillet. Install three hinges for each leaf: one in the middle of the joint and one 5 inches from each end. With a paper shim inserted between the leaf and top, position a hinge leaf against the top and the other against the leaf at each hinge location so the pin is aligned with the fillet line, then outline the hinge. Chisel out the mortises, using a wider-blade tool to cut the mortises for the hinge leaves (page 113) and a narrower chisel to cut the slots for the pins (right). Screw the hinges in place.
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