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