OK, now someone explain to me WHY springs weaken.
I have never seen it happen, except from: overheating (fire,) rust, or over compression/extension. I make springs from high carbon steel, and have for many years. I have never had one "get weak." Why?
I have seen gun and knife springs that are over 150 years old that work fine.
Assuming proper design, heat treat, materials, and use- here is what will happen to a spring after many,many thousands of cycles: the steel will "work harden," or become brittle-and the spring will break. But, it won't "get weak."
So I want someone to, metallurgically speaking, explain to me all this "spring weakening."
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