{HEAD ~ The invention} eliminates substantially all of the machining and totally eliminates {TAIL ~ that part} of the machining requiring a high degree of accuracy and alignment 
{ HEAD ~ The invention } eliminates substantially all of the machining and totally eliminates { TAIL ~ that part } of the machining requiring a high degree of accuracy and alignment
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH