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The second part I call the boxing, which is pictured below. This part is a little more challenging to measure. With the instrument still side down on the paper simply work your way around the perimeter of the side panel measuring, the height of the instrument at 4 to 6 inch intervals. The challenge is to first, mark the spot on the paper from which you make the measurement, and then make sure your ruler is perpendicular to the paper.
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