Patent ID: 8029382
Filing Date: 2011-10-04
Classification: A63B

Abstract:
1. A golf-club kit, comprising: a shaft having a longitudinal axis, a tip-end, a butt-end, a reduced-EI portion, a remaining portion extending between the reduced-EI portion and the butt-end, a centering ferrule affixed to the shaft, and a ferrule sleeve affixed to the shaft downstream of the centering ferrule; a clubhead that is individually selectable and mountable to the tip-end of the shaft, the clubhead having a respective clubhead body and a respective hosel, the body having a heel and defining a through-bore extending along the axis from the hosel to the heel, the through-bore defining a shouldered aperture; the ferrule sleeve extending distally from the shouldered aperture in the hosel of a clubhead mounted to the tip-end, the ferrule sleeve including a female thread located coaxially in the through-bore and a male thread located coaxially outside the through-bore upstream of the hosel; a female-threaded collar configured to be threaded onto the male thread of the ferrule sleeve; a securing screw including a head, a male thread, and a distal end, the securing screw being configured to extend axially through the shouldered aperture and be threaded into the female thread of the ferrule sleeve sufficiently for the clubhead mounted to the tip-end to engage a shoulder of the shouldered aperture; and multiple stiffener sleeves each having a respective predetermined stiffness and each being individually selectable for attachment to the outside of the shaft between the centering ferrule and the female-threaded collar to provide a respective desired stiffness contribution to at least a portion of the reduced-EI portion, each stiffener sleeve having a distal end, configured to engage the centering ferrule, and a proximal end configured to be engaged by the female-threaded collar such that axial turning of the female-threaded collar urges and tightens the stiffener sleeve to the shaft.