The buck wheel openings are only rough edge at this point. The wheel openings on the clay are an arch of varying radius. So a measurement was taken from axle center to find the largest radius, generally at the bottom of the wheel openings. A circle with that largest radius was then drawn on the clay model and buck as a reference line. Marking the difference between the reference and edge of the clay defines the edge on the buck. A french curve is used to complete the cut to line.
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