The ornamental design for a pullerstick, as shown and described.
FIG. 1 is a perspective view of a puller stick showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a top plan view thereof.
The broken lines in the drawings depict portions of the puller stick that form no part of the claimed design. The design shown is not to be limited to any particular size and may be scaled larger or smaller.