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 
into
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 REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH