Abstract: A bow tuning tool has two coupling mechanisms. The first of these coupling mechanisms makes coupling contact with the archer's bow. The second makes coupling contact with an arrow shaft. By coupling the arrow shaft to the tool and bringing the tool into coupling contact with the bow, tuning adjustments to the blow are facilitated. A three-in-one bow tuning tool is derived: a Bow Square and Nock Set, used to set the height of an adjustable arrow rest and to locate nock points; a Bow Center set for setting the flight path of the arrow shaft past the bow; and, a Bow Tiller Gauge to equalize the setting of the tiller height above and below the point on the bow at which the bow is gripped.