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