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