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