Abstract: The improved convergence core assembly utilizes a separate carriage for the convergence core. This separate carriage properly aligns and holds the convergence core in relation to the convergence core assembly. In particular embodiments, the separate core carriage provides self centering and positional stability for the convergence core in the x-y plane, in the z-axis, and rotationally in the x-y plane. To accomplish this, the core carriage includes means for positioning the convergence core in the convergence core assembly. In certain embodiments, the means for positioning includes leaf springs and positioning tabs. The leaf springs tend to force the electromagnetic coil assembly against the stops of the positioning tabs to properly locate the convergence core in the z-axis. The positioning tabs also exert opposing spring forces on the convergence core to center the convergence core assembly in the x-y plane.