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