Surely the length of the lever arm dictates the amount of torsional twist or 'spring' that gets loaded up within the ARB for any given suspension travel. It's the gearing if you like.
Slow one knows what he's talking about. Your comment about the longer lever giving a softer result through its own 'springiness' might be true, given the scaling issues with model car design, although not at all how an ARB is designed to work. It would effectively be the same as modestly increasing the spring rate.
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