Each of {HEAD ~ the inside surfaces} of {TAIL ~ the two external washers} comprise an actuation plane corresponding to one of the associated lateral retaining elements 
of
Each of { HEAD ~ the inside surfaces } of { TAIL ~ the two external washers } comprise an actuation plane corresponding to one of the associated lateral retaining elements
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH