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