FIG. 1 is a front, top, right perspective view of a thumb rest for a joystick showing the new design;
FIG. 2 is a rear, top, left perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left-side elevation view thereof;
FIG. 6 is top plan view thereof; and,
FIG. 7 is bottom plan view thereof.
The broken lines of uneven length shown in the drawings illustrate the boundary of the claimed design and form no part thereof. The broken lines of even length shown in the drawings illustrate portions of the joystick that form no part of the claimed design.