FIG. 1 is a front view of a support jack showing my new design;
FIG. 2 is a side view of the left side of FIG. 1,
FIG. 3 is side view of the right side of FIG. 2,
FIG. 4 is a rear view,
FIG. 5 is a top view; and,
FIG. 6 is a bottom view.
The ornamental design for a support jack, as shown and described.