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