We claim the ornamental design for a heel insert for a foot pedal, as shown and described.
FIG. 1 is a right-side perspective view of the heel insert for a foot pedal of the present invention;
FIG. 2 is a left-side perspective view of the heel insert for a foot pedal;
FIG. 3 is a right bottom perspective view of the heel insert for a foot pedal;
FIG. 4 is a left bottom perspective view of the heel insert for a foot pedal;
FIG. 5 is a front elevation view of the heel insert for a foot pedal;
FIG. 6 is a rear elevation view of the heel insert for a foot pedal;
FIG. 7 is a right-side elevation view of the heel insert for a foot pedal;
FIG. 8 is a left-side elevation view of the heel insert for a foot pedal;
FIG. 9 is a top view of the heel insert for a foot pedal;
FIG. 10 is a bottom view of the heel insert for a foot pedal; and,
FIG. 11 is a perspective view of the heel insert for a foot pedal associated with a foot pedal.
FIGS. 3, 4, 6, and 10 show features with broken lines. FIG. 11 shows features of a foot pedal associated with the heel insert for a foot pedal with broken lines. These features are for illustrating reference of environmental structure only and do not form any part of the claimed design.