A toothed arch block is mounted within the box end is and forced by the spring into engagement with {HEAD ~ the ratchet wheel} to limit {TAIL ~ rotary motion} of the ratchet wheel inside the box end to one direction 
to limit
A toothed arch block is mounted within the box end is and forced by the spring into engagement with { HEAD ~ the ratchet wheel } to limit { TAIL ~ rotary motion } of the ratchet wheel inside the box end to one direction
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH