The ornamental design for a swimming pool brushing disk, as shown and described.
FIG. 1 is a side elevational view of a swimming pool brushing disk attached to a typical pool vacuum cleaner. The disk has a vinyl upper surface and a lower surface consisting of a woven fabric pile. The pool vacuum cleaner is shown in broken lines for illustrative purposes only and forms no part of the claimed invention;
FIG. 2 is a top plan view shown on an enlarged scale thereof;
FIG. 3 is a bottom plan view shown on an enlarged scale thereof; and,
FIG. 4 is a right side elevational view shown on an enlarged scale thereof, the left side, the top side and the bottom side elevational views being mirror images.