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