Jack Conversion Head

FIG. 1 is a perspective view of a jack conversion head showing my new design; FIG. 2 is another perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a back view thereof; FIG. 5 is a left view thereof; FIG. 6 is a right view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is a partial enlarged view of portion 9 in FIG. 1 ; FIG. 10 is a partial enlarged view of portion 10 in FIG. 2 ; and, FIG. 11 is a perspective view thereof shown in another usage state, that is, the jack conversion head is used upside down. The broken lines depict portions of the jack conversion head and form no part of the claimed design.