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