manually actuateable and adjustable means for applying air under a predetermined pressure to the side of said piston adjacent said rear end at {HEAD ~ a desired rate} to cause {TAIL ~ forceful movement} of said piston from said rear end to said front end of said tubular member 
to cause
manually actuateable and adjustable means for applying air under a predetermined pressure to the side of said piston adjacent said rear end at { HEAD ~ a desired rate } to cause { TAIL ~ forceful movement } of said piston from said rear end to said front end of said tubular member
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH