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