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If I remember right, don't you just compress the spring 75% of free length, measure it's force of deflection. compress the spring 20% of free length and measure the force of deflection.
divide the difference in force values by the difference in lenths
(F2-F1) / (L1-L2)
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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