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 the insert form cutter to cut a plurality of {HEAD ~ grooves} into {TAIL ~ the tube} 
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 the insert form cutter to cut a plurality of { HEAD ~ grooves } into { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL