The ornamental design for a drum stickfingerholder, as shown and described.
FIG. 1 is a front view of a drum stick finger holder, showing my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a perspective view thereof in an exemplary environment.
The broken lines in the drawing in FIG. 7 showing the hand of a person and the drum stick represent environmental matter and form no part of the claimed design.