A toothed front side forced by the spring force into engagement with {HEAD ~ the ratchet wheel} in {TAIL ~ the box end} 
in
A toothed front side forced by the spring force into engagement with { HEAD ~ the ratchet wheel } in { TAIL ~ the box end }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL