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Old 10-13-2012, 01:21 AM   #4 (permalink)
binary0x01
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You can have it measured, with proper equipment.

Call up a university near you, just a hint

http://www.engineersedge.com/spring_tension_calc_k.htm gives you a pretty good, rough estimate, but to be more exact you'd need material sample for density (if they use compound alloy it will reduce the error if you know it).
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