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