With the insert installed as shown in FIG 2, the holder can be rapidly rotated about {HEAD ~ its axis} 20, to cause {TAIL ~ the cutting edge} 30 of the insert to move about the axis 20 and cut a thread 
With the insert installed as shown in FIG 2 , the holder can be rapidly rotated about { HEAD ~ its axis } 20 , to cause { TAIL ~ the cutting edge } 30 of the insert to move about the axis 20 and cut a thread
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH