A plurality of {HEAD ~ annular grooves} are formed in {TAIL ~ the inside wall} of the cylinder, adjacent the end opposite the needle end of the cylinder 
A plurality of { HEAD ~ annular grooves } are formed in { TAIL ~ the inside wall } of the cylinder , adjacent the end opposite the needle end of the cylinder
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH