The effective k varies from the original k by the square of the lever ratio. If the lever were instead a pair of gears of radii a and b, the result would be the same. So, gear or lever ratios can have a large effect on the lumped parameters' values in the simplified model.
Damping coefficients are also affected by the lever ratio. Figure I 0-8d shows a damper and a mass at opposite ends of a lever. If the damper at A is to be replaced by a damper at B, then the two dampers must produce the same moment about the pivot, thus