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