first retaining {TAIL ~ means} comprising {HEAD ~ a plurality} of radially extending means on said retaining ring, 
first retaining { TAIL ~ means } comprising { HEAD ~ a plurality } of radially extending means on said retaining ring ,
OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH