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