Each recess includes {HEAD ~ a hole} in {TAIL ~ an inner bottom} thereof so that the two pawls are pivotably inserted in the two holes by their respective shafts 
Each recess includes { HEAD ~ a hole } in { TAIL ~ an inner bottom } thereof so that the two pawls are pivotably inserted in the two holes by their respective shafts
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH