The ornamental design for a golfshaft, as shown and described.
FIG. 1 is a perspective view of a golf shaft on a driver, the enlarged fragmented section is shown for clarity of the 3 dimensional shape; and,
FIG. 2 is another perspective view of a golf shaft on a flag stick, the enlarged fragmented section is shown for clarity of the 3 dimensional shape.
The broken line showing of the club head and handle of FIG. 1 and the flag and ground of FIG. 2 are included for the purpose of illustrating and forms no part of the claimed design. The broken lines disclosed on the fragmented enlarged sections are shown for ease of illustration.