FIG 4 is {HEAD ~ a perspective view} of {TAIL ~ a washer} to be used in conformity with the invention 
of
FIG 4 is { HEAD ~ a perspective view } of { TAIL ~ a washer } to be used in conformity with the invention
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH