The insert 21 typically also comprises {TAIL ~ sidewalls} 59 that define {HEAD ~ an obtuse angle} with the bottom surface 35 of the insert 
The insert 21 typically also comprises { TAIL ~ sidewalls } 59 that define { HEAD ~ an obtuse angle } with the bottom surface 35 of the insert
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH