I am of the opinion that a spring when left in the set position , WILL weaken with time. If left in the set position they will not get useless but they will fail to return to their full relaxed position.
I get springs made fairly often and with time I have noticed IF a spring goes to a 180 degree full open , that when left set will regress to app 175 degrees.
But I plan on having an answer in the near future for everybody !
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