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Hi Jack. I think that Michelson is adding the force in the springs and then uses the deflection in the large spring to give the resultant movement. This is depending on the stiffness of the springs and I think it can be tricky to find a good combination of spring. The small ones must as equal as possible and the large one must be that stiff so the rocker movement will be small, but small enough to get any movement.Good luck and have fun with your bigger one
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