That's kind of my thinking. Sure, working the spring back and forth will definitely weaken the spring over time, just like the springs on a truck, but I'm thinking that you'd have to do it thousands of times for it to wear out the metal. I like your example about old 330's stored for long periods with the springs compressed. It makes sense to me that the metal will get used to being in that position and get weaker. I'm an ease the spring guy.
