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