A quick check for your 1/12th front springs is to both springs over a screw driver of the right diameter (on top of each other) and then compress the top spring over the bottom spring. If both springs are equal, then they will compress at the same rate and be fully compressed at exactly the same time. If one is stronger than the other, it will compress at a slower rate meaning that the weaker spring compresses fully before the stronger one does. I hope you see what I mean by that and you would be amazed how far out some 'pairs' of new springs really are!! All the best, Chris.