said sleeve is formed with {HEAD ~ entrances} to said at least one shaft at {TAIL ~ opposite narrow ends} of said sleeve, 
at
said sleeve is formed with { HEAD ~ entrances } to said at least one shaft at { TAIL ~ opposite narrow ends } of said sleeve ,
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH