The inside surface of {HEAD ~ the replaceable cutter shell} 49 mates with {TAIL ~ the surface} on the rolling cutter shell 48 
The inside surface of { HEAD ~ the replaceable cutter shell } 49 mates with { TAIL ~ the surface } on the rolling cutter shell 48
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH