{HEAD ~ The apparatus} of the present invention also includes means for driving the cutting tool assembly into and out of engagement with {TAIL ~ the tube} 
{ HEAD ~ The apparatus } of the present invention also includes means for driving the cutting tool assembly into and out of engagement with { TAIL ~ the tube }
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