The ornamental design for a barebackmountingaid, as shown and described.
FIG. 1 is a front view of a horse and rider showing the environment of use of the bareback mounting aid;
FIG. 2 is a front elevation view of the bareback mounting aid with the clip disengaged for reasons of clarity;
FIG. 3 is a rear elevation view thereof with the clip disengaged for reasons of clarity;
FIG. 4 is a left side elevation view thereof with the clip disengaged for reasons of clarity;
FIG. 5 is a right side elevation view thereof with the clip disengaged for reasons of clarity; and,
FIG. 6 is an elevation view thereof showing the clip engaged.
The portions of the horse and rider shown in broken lines in FIG. 1 are directed to environment only and do not form part of the design. The other broken lines in FIGS. 1-6 represent unclaimed structure. The break lines shown in the drawings indicate no specific length of those portions of the bareback mounting aid.