This tool makes it possible to check if the axle holes of the bow are square to the limbs. Axle hole squareness affects the way the bow delivers the arrow. Often times this overlooked, and you may receive a bow where the axle holes are not square. If your axle holes are not square to your limbs, it can cause excessive bushing wear, horrible wheel lean, bad nock travel, and a headache when trying to tune your bow.
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