providing a thrust plate, affixed at {HEAD ~ the distal end} of said plunger, said thrust plate being of sufficient size to extend laterally beyond {TAIL ~ the perimeter} of the distal end of said cylindrical passage 
providing a thrust plate , affixed at { HEAD ~ the distal end } of said plunger , said thrust plate being of sufficient size to extend laterally beyond { TAIL ~ the perimeter } of the distal end of said cylindrical passage
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH