The ratchet housing 92 extends inwardly from {TAIL ~ the inside surface} of {HEAD ~ the drill string} 32 and washover pipe 40 
The ratchet housing 92 extends inwardly from { TAIL ~ the inside surface } of { HEAD ~ the drill string } 32 and washover pipe 40
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH