Well, I'm not trying to read John's mind, but here is my explanation. John's steady, like the original, does a good job of stopping low-frequency, large-excursion vibrations, that is, those that would be most damaging. High-frequency, small-excursion vibrations are damped in the circumferencial rubber of the mount rather than transmitted to the joint between the head and the rocker box.
Does that about say it John?
Richard L.