Once in proper location, as determined in any number of known ways, such as by pressure, distance, or electronic eye, the cutting tool assembly 16 rotates about the tube 20, causing {HEAD ~ the insert form cutter} to cut {TAIL ~ a plurality} of grooves into the tube 
to cut
Once in proper location , as determined in any number of known ways , such as by pressure , distance , or electronic eye , the cutting tool assembly 16 rotates about the tube 20 , causing { HEAD ~ the insert form cutter } to cut { TAIL ~ a plurality } of grooves into the tube
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 OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH