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