"Spring do not lose temper from being compressed."
"But they do lose temper from repeated flexing."
Good springs will do neither; bad springs will do both.
I have often stated that good magazines springs will not lose tension from being compressed, even for decades. But not all springs are good, and some of those now being sold are pretty bad. I once removed the long-loaded magazine from a 1911A1 "bureau drawer defense gun". I turned the magazine upside down and shook it - six rounds fell on the floor, the follower stayed down. The spring came out as a compact mass with no tension at all. The owner was not ignorant, he fired in competition, but never checked his HD gun. The magazines were gun show "bargains", sold as GI surplus; they weren't.
Jim
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