Cotten; The center knob moves the verticals toward and away from the drum. You loosen the wing nut and swing the rollers in and out. I'm not sure if there was a guide for the different radius's. Maybe Chicago Rivet has more info on it. They still take these old machines in for repair!
Craig000_0964.jpg000_0963.jpg
Craig000_0964.jpg000_0963.jpg
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