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