The tieback member carries a locking device which will engage {HEAD ~ an annular groove} formed in the bore of {TAIL ~ the wellhead housing} 
The tieback member carries a locking device which will engage { HEAD ~ an annular groove } formed in the bore of { TAIL ~ the wellhead housing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL