The ornamental design for a golfclubshaft, as shown and described.
FIG. 1 is a front elevational view of a golf club shaft showing our new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a top plan view thereof; and,
FIG. 4 is a bottom plan view thereof.
The broken lines are environmental only and form no part of the claimed design. The broken lines at the ends of the shaft in FIGS. 1-4 indicate indeterminate length.