A method is disclosed for installing and optimizing adjustable swing-weight in a vibration-damped manner inside a
golf club shaft. A plug
assembly of selectable weight is inserted through a circular opening in the golf grip cap with a special tool, moved to any desired location within the shaft and securely fastened in place in a vibration-damped manner by a resilient, cylindrical, radially-expandable element. At least one weight rod, made available in different materials, lengths and weights, is spaced from the shaft by one or more resilient
damper sleeves to minimize shaft vibration. The expandable element is secured by a
machine screw threaded into the upper end of the weight rod, and is dimensioned (unexpanded) so as to enable easy
insertion and location adjustment of said plug
assembly. The tool provides dual functions: as a
screw head driver to expand / contract the expandable element radially by
axial pressure / release as required, and as a removable coupler capable of pulling the plug
assembly (with the expandable element unexpanded) upwardly, as well as pressing it downwardly within the shaft for adjustment to any desired location.