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Shaft orientation also know as spining, puring,
or optimizing There has been a lot of talk lately about club shafts and their spines. The discussion is deserved because of a change in the interpretation of a USGA rule. Rule 4-1b states: “b. SHAFT The shaft shall be generally straight, with the same bending and twisting properties in any direction…” Appendix II 4-1b states, “BENDING AND TWISTING PROPERTIES. The shaft must be so designed and manufactured that at any point along its length: (i) it bends in such a way that the defection is the same regardless of how the shaft is rotated about its longitudinal axis, and (ii) it twists the same amount in both directions.” The intent of the Rule is to prevent the manufacture of shafts, which would enhance the shot due to their asymmetrical shape. For instance, a shaft which would be made oblong to take advantage of its nonsymmetrical properties. There is a catch 22 here. It is impossible to construct a shaft, which is perfectly symmetrical. No matter how well a shaft is made. No matter how tight the construction tolerances are in making the shaft. It is impossible for a shaft to be made which holds the exact same wall thickness all the way around its circumference. Every shaft made has a spine or heavy area running its length. As stated above this spine or heavy area is created as a part of the shaft making process. The shaft is then stiffer where this spine is located. This is evident when you place the shaft in a frequency machine and rotate it. It will read stiffer when the spine is oriented in the direction the shaft is deflected. Clubmakers have known for years that this has an effect on the performance of the club. It can have an even bigger effect on the feel of the club. When the spine is set at 90 degrees to the direction of the shot, toward the heel of the club or away from the golfer (toward the toe), the club is effected adversely. In research done by Tom Wishon while he was at Golfsmith he found that there was a difference of about 2 miles per hour ball speed between the shaft’s worse and best orientation. There was also a launch angle difference of .7 degrees lower when the spine was located in the best orientation. More than 200 TOUR players during the past five years have had their golf shafts spine aligned by one or more servies. The benefits of spining include dramatic improvement in solid impact with the ball and enhancing accuracy, feel, and trajectory control. I am convinced that spining your shaft will double or triple your pleasure from a round of golf. If you wish to have your shafts oriented, we will be glad to offer this service to you for a minimal fee. | |||||||||||||||||||||||||||||||||||||||