Cut a 35mm length of the 07/16" x 20 Swg copper tube from the length supplied using a fine toothed hacksaw, taking care not to grip too tightly and deform the tube. Hold in a self-centring chuck with 5mm protruding and face off the sawn end using a sharp right-hand knife tool. Remove any sharp edges produced internally and externally. Turn the tube around. Hold in a self-centring chuck with 5mm protruding, face off end. Remove and measure. From this measurement deduct 32mm and re-chuck. Machine that amount from the tube. Remove any sharp edges produced internally and externally. Put to one side.
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机译：使用细齿钢锯从提供的长度上切下35mm的长度为07/16“ x 20 Swg的铜管，注意不要太紧地握住并使其变形。握住具有5mm突出且面朝下的自定心卡盘用锋利的右手工具将锯切的末端移去，将内部和外部产生的任何尖锐的边缘移开，将管子转过来，握住自定心卡盘，突出5mm，面朝下的一端，取出并测量，从此测量中减去32mm然后从管子上取下一定量，除去内部和外部产生的任何尖锐边缘，放在一侧。
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