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The measurements are transferred to a flat sheet of 0.065-inch grade 3003-H14 aluminum, which is strong but relatively easy to shape. Stone added 3 inches around the perimeter, which will become the flange of the shroud. After finding the center point of the opening he marked out the circumference with a compass. He reduced the 15-1/2-inch circle by 1/4-inch in order to create a lip.