this thread sort of got hijacked; oh well. jhandy is the original poster selling springs / rear sway. i'm also selling springs, but my price is higher! :-)
anyway, in material science, the spring rate of a steel spring NEVER changes with age or use, it is a constant forever. what DOES change is the spring LOAD, which is essentially its uncompressed length. REALLY old springs can sag. in the case of the M030, this really won't happen during the life of the car; the wire stock is too high a quality. you can feel comfy buying used springs.
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