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In article ,
says...
Glenn Ashmore wrote:

Is there any rule of thumb about how far can stretch a spring before it is
"sprung". i.e. permanently deformed?

If it is an compression spring (at least designed for), you can compress
it until it is a block. That travel is OK for the reverse direction too.

But many compression springs will fail prematurely if used this way in a
cyclical application.

Ned Simmons