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