BILL TAYLOR FITTING RING-SWOVEL BLUE

Created by Bill Taylor more than 30 years ago, the BT Fitter provides an economical and very reliable way to fit all types of bowlers. The recently rewritten instruction manuals provide the insight you need to get the most out of these tools. The Swoval provides all of the benefits of the BT Fitter, and adds a pivoting thumb cavity, making it easy to determine the best angle for drilling oval thumb holes.