A series of passageways 63 extend radially between {TAIL ~ the inner and outer surfaces} 60, 58 of the sleeve 14 above the level of {HEAD ~ the lip} 62 
A series of passageways 63 extend radially between { TAIL ~ the inner and outer surfaces } 60 , 58 of the sleeve 14 above the level of { HEAD ~ the lip } 62
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH