A way to make the first curve is to use a piece of cord/string as a compass. Tie a loop in one end. And then put a pin/nail/something on a base at the center of the curve. This is hard part, finding a place to anchor the string. Then put a loop in the other end so the distance between the loops is the radius you want. Hold a pencil in the second loop and keeping the string taut and the pencil vertical, draw a line on your benchwork to locate the curve.
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