The ornamental design for a head for a golfputter, as shown and described.
FIG. 1 is a top front perspective view of a head for a golf putter;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof; and
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top rear perspective view thereof.
The broken line showing of the hosel and shaft is included for the purpose of illustrating environmental elements for use by a right-handed golfer and forms no part of the claimed design.