{HEAD ~ a middle portion} between {TAIL ~ said two free ends}; said middle portion disposed in the borehole of the first component and each said free end protruding from an opposite borehole opening of the borehole; and 
between
{ HEAD ~ a middle portion } between { TAIL ~ said two free ends } ; said middle portion disposed in the borehole of the first component and each said free end protruding from an opposite borehole opening of the borehole ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH