The only round mortises in the Enfield chair that are drilled at 90° are those in the front legs for the front rails and stretchers. Use your story pole (page 28) to outline the hole locations on the front legs and bore them on your drill press. Cut a V-shaped wedge out of a wood block, creating a jig that will cradle the legs as you drill the holes. Install a bit the same diameter as the rail and stretcher tenons, and clamp the jig to the machine table so the bottom of the V is centered under the bit. Then place the leg in the jig and set the drilling depth to slightly more than the tenon length—about two-thirds the stock diameter. Holding the leg with one hand, bore the mortises (left). Repeat for the other front leg.
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