Shifting {HEAD ~ the position} of the inserts relative to {TAIL ~ the feed path} of the electrode allows more than one portion of each cutting edge on the insert to be used 
Shifting { HEAD ~ the position } of the inserts relative to { TAIL ~ the feed path } of the electrode allows more than one portion of each cutting edge on the insert to be used
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH