Easton Nock Tuning Tool is a great tool that enables you to quickly tune your nocks whilst on the line or out in the bush. A must for every archer. Insert nock into the Nock Tool until it is fully seated inside the Nock Tool. If using a shaft with UNI (Universal Nock Installation) Bushing, insert the nock shank into the UNI Bushing or arrow shaft. Press and rotate the nock until it seats completely inside UNI Bushing or arrow shaft. The Nock Installation Tool can be used after fletching to ensure proper nock alignment and fletching clearance.