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Find center on a tapered, curved rail

Find center on a tapered, curved rail

My chair plans called for turned, tapered, and steam-bent back rails, so I needed a way to find the centerlines to position the holes for the back spindles. This easy jig did the trick.

Drill a pencil-size hole through a 3⁄4 x 1  1⁄2 x 1  1⁄2″ block, cut a V-shape notch into it, centering the notch in the block. Glue a small bubble level on one edge, and insert the pencil, as shown. Working on a flat, level surface, with the pencil pressed to the rail, run the V-block along the rail while keeping the bubble centered. The resulting centerline follows the tapers, bends, and curves of the rail.
—Ted Sheroke, Medina, Ohio

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