{HEAD ~ a toothed arch block} mounted in {TAIL ~ said box end} and operatively associated with said ratchet wheel 
{ HEAD ~ a toothed arch block } mounted in { TAIL ~ said box end } and operatively associated with said ratchet wheel
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH