In Search of the Missing Fundamental: by Richard K. Jones
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Step No. 4

Leveling the head

If the counterhoop is flush or level, and the lip of the bowl is flat and in plane, you can use a product like the TAP™ Head Gauge (ca. $20.00) to get the head somewhat balanced with relative tension at each lug, a process called leveling. This process will get you in the ballpark, but only works well if the counterhoop is flush, and the lip of the bowl is flat and in plane. If the counterhoop is not flush or the lip of the bowl is not flat and in plane, this process does more harm than good, in which case the counterhoop and/or the bowl needs to be fixed or replaced. If you know the counterhoop is not flush, or that the lip of the bowl has issues, avoid this process and go on to the next step and hope for the best.

 

Make sure that the drum itself is level and pick a point at which to begin. Position the block on the head so that the pointer (set screw and cap-nut) is centered in the middle of the counterhoop directly in front of a lug. Adjust the pointer so the cap-nut barely touches the rim and lock it in place with the wing-nut. Following the cross-tuning sequence below, place the gauge on the head and adjust each lug until you do not see any daylight between the block and the head.


diagram courtesy of the Yamaha Corporation

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