The ornamental design for a steeringwheelcovercore, as shown and described.
FIG. 1 is a front perspective view of the steering wheel cover core of the present invention;
FIG. 2 is a front elevation plan view of the steering wheel cover core of the present invention, the rear elevation view being a mirror image thereof;
FIG. 3 is a left side elevation view of the steering wheel cover core of the present invention, the right side elevation view being a mirror image thereof; and,
FIG. 4 is a top plan view of the steering wheel cover core of the present invention, the bottom plan view being a mirror image thereof.