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