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