The replaceable cutter shell 49 will be locked on {TAIL ~ rolling cutter shell} 48 until replacement is required at the end of {HEAD ~ the cutting structures service life} 
The replaceable cutter shell 49 will be locked on { TAIL ~ rolling cutter shell } 48 until replacement is required at the end of { HEAD ~ the cutting structures service life }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD