The ornamental design for a housing for a magneticblade sharpener, as shown and described.
FIG. 1 is a perspective view showing the top, the front and the left side
of the housing for a magnetic blade sharpener showing my new design;
FIG. 2 is a left side elevation view, this view and the opposite right side
elevation being of identical design, the broken lines representing safety
razors are shown for illustrative purposes only and form no part of the
claimed design;
FIG. 3 is a top plan view;
FIG. 4 is a bottom plan view; and,
FIG. 5 is a front elevational view, this view and the opposite rear
elevation being of identical design.