{TAIL ~ The replaceable cutter shell} 49 includes {HEAD ~ a pair} of annular disc elements 50 and 51 
{ TAIL ~ The replaceable cutter shell } 49 includes { HEAD ~ a pair } of annular disc elements 50 and 51
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH