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