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