In a preferred embodiment, the ring gear is a rearwardly facing beveled gear for use with a beveled drive gear and the head portion defines a forwardly directed thrust surface engageable by a bearing surface of {TAIL ~ the drive tool} to urge the drive gear against {HEAD ~ the ring gear} 
In a preferred embodiment , the ring gear is a rearwardly facing beveled gear for use with a beveled drive gear and the head portion defines a forwardly directed thrust surface engageable by a bearing surface of { TAIL ~ the drive tool } to urge the drive gear against { HEAD ~ the ring gear }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD