The washer 13 consists of {HEAD ~ a disklike flat portion} 16 for pressing and fixing {TAIL ~ a piece} of covering material in place, and a plurality of leaf spring like projections 15 extending radially inwardly of the flat portion, with a gradual descent to a given length, until they terminate convergently 
for pressing
The washer 13 consists of { HEAD ~ a disklike flat portion } 16 for pressing and fixing { TAIL ~ a piece } of covering material in place , and a plurality of leaf spring like projections 15 extending radially inwardly of the flat portion , with a gradual descent to a given length , until they terminate convergently
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH