The outer surface of the rolling cutter shell 48 slopes in wedge fashion and {HEAD ~ the inner surface} of replaceable cutter shell 49 is of {TAIL ~ a corresponding shape} 
is of
The outer surface of the rolling cutter shell 48 slopes in wedge fashion and { HEAD ~ the inner surface } of replaceable cutter shell 49 is of { TAIL ~ a corresponding shape }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL