Buck and Paul did a great job describing the process which is a bit tedious. Since the standard VPI counterweight is offset (the hole is not centered) rotating it is how you effectively vary the azimuth setting. Once you make a change in its position and see the effect on the azimuth (by checking the height of both ends of the metal bar against an index card) you'll better grasp the concept. Remember that patience is a virtue, and you'll get it set properly after several iterations of making adjustments and rechecking the VTF.
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