FIG. 1 is a top perspective view of a fixture for restraining a turbine wheel showing my new design. FIG. 2 is a bottom perspective view thereof; FIG. 3 is a left side view thereof; FIG. 4 is a right side view thereof; FIG. 5 is a top view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is a front view thereof; and, FIG. 8 is a rear view thereof.