A locking device will lock {HEAD ~ the tieback member} to {TAIL ~ the groove} in the wellhead housing 
to
A locking device will lock { HEAD ~ the tieback member } to { TAIL ~ the groove } in the wellhead housing
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH