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Only way I can think of to give you any useful info without slapping them in the guns would be to attempt to measure the spring constant. If you have a couple of springs you know the speed of use them as guide lines. Attach a mass of a specific height to the spring and see how much it stretches. Do this for all your springs and compare the results to the known values. Gives you a good ball park. The ones that stretch less are stronger and the ones that stretch the most are weakest.
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