The string engaging assembly relatches {TAIL ~ the mandrel} to {HEAD ~ the drill string} when the drill string is moved away from the object and rotated in a second direction 
The string engaging assembly relatches { TAIL ~ the mandrel } to { HEAD ~ the drill string } when the drill string is moved away from the object and rotated in a second direction
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH