The ornamental design for a handle attachment for a rotary hand tool, as shown and described.
FIG. 1 is a front left isomeric view of a handle attachment for a rotary hand tool;
FIG. 2 is a left plan view of a handle attachment for a rotary hand tool shown in FIG. 1;
FIG. 3 is a right plan view of the handle attachment for a rotary hand tool shown in FIG. 1;
FIG. 4 is a front plan view of the handle attachment for a rotary hand tool shown in FIG. 1;
FIG. 5 is a rear plan view of the handle attachment for a rotary hand tool shown in FIG. 1;
FIG. 6 is a top plan view of the handle attachment for a rotary hand tool shown in FIG. 1; and,
FIG. 7 is a bottom plan view of the handle attachment for a rotary hand tool shown in FIG. 1.
The broken line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.