Dickey digs into the leather with the nails of his index and middle fingers just behind the runway, where the ball's seams are closest together; he places his thumb and ring finger on the sides of the ball. He keeps his nails even with a fine-tooth glass file and strong with the nail-hardening product Trind. Nails are a vital stabilizing force, enabling Dickey to release the ball with almost no spin.
Source: http://www.popularmechanics.com/outdoors/sports/physics/anatomy-of-a-knuckleball?src=rss
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