Patent ID: 6993970

Claim:
A method of determining a preferred angular orientation of a golf club shaft about a longitudinal axis thereof, said golf club shaft having a proximal end for gripping by a golfer and a distal end for attachment to a golf club head, said method comprising: immobilizing a first one of said proximal end and said distal end of said golf club shaft; initiating vibratory motion, in a plane, of a second one of said proximal end and said distal end of said golf club shaft; measuring said vibratory motion by: providing on said shaft at least two energy reflective surfaces at angles oblique to said plane, directing a respective energy beam at each of said reflective surfaces, detecting a respective reflected beam reflected from each of said surfaces, calculating from said detected beams distances of said surfaces from one or more fixed locations during said vibratory motion, and deriving displacement of said shaft from said calculated distances; analyzing said measured vibratory motion; and calculating from said analyzed vibratory motion said preferred angular orientation.