Use a band saw to cut a curve or large groove in the circular or oval piece of stock. The size and shape of the curve are up to you.
Wrap a piece of steel strapping around the edge of the jig, and screw it in place. Screw the jig in place on the scrap piece of flat wood.
Wrap sheet metal around the circumference of the jig and into the curve or groove. Continue wrapping the metal until you've bent it to the desired shape.
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