I have tuned a number of K, L, and N frame revolvers. I now have a small bag full of main springs and rebound springs. Two thirds of them are stock S&W springs. The others are unidentified reduced rated Wolf and Wilson springs. These things are cheap enough but I would still like to identify and sort them by spring rating. Flexing them in my hands does not seem to be a reliable means of measurement. Is there a simple way of doing this without fabricating and calibrating a spring rating jig? Making such a jig would be more trouble than these springs are worth.