[s-cars] spring constants

[Voits]

Trevor, Richard, et. al.:
What is the proper way to measure spring constants, anticipating that the
spring *might* have a progressive design?
I'm preparing to measure and document the Stock, Eibach, OEM/'92/Euro Sport
springs in the near future as part of my ($$) "not too soft, not too firm,
just right" quest.  Right now I'm too firm.
All the best,
Steve V.
95.5 S6
Seattle