{HEAD ~ a sleeve} supported within said housing, said sleeve having a central opening, a plurality of peripheral grooves disposed about said central opening and a plurality of openings peripheral to and confluent with {TAIL ~ said central opening}, 
{ HEAD ~ a sleeve } supported within said housing , said sleeve having a central opening , a plurality of peripheral grooves disposed about said central opening and a plurality of openings peripheral to and confluent with { TAIL ~ said central opening } ,
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH