The ornamental design for a handle for handtool, as shown and described.
FIG. 1 is a perspective view of the present design;
FIG. 2 is a front view of the present design;
FIG. 3 is a rear view of the present design;
FIG. 4 is a left side view of the present design;
FIG. 5 is a right side view of the present design;
FIG. 6 is a top view of the present design; and,
FIG. 7 is a bottom view of the present design.
The evenly spaced broken lines depict portions of the handle for hand tool that form no part of the claimed design. The long and short broken lines indicate the boundary of the claimed design.