Vibration control inside a cabinet

Tom, while I can appreciate your persistence in this matter, apparently there CAN be isolation where there is MOTION as demonstrated by LIGO, the 4 km long interferometer experiment to detect gravity waves - the most critical portion of which is the vibration ISOLATION system - which BTW was successful last year in detecting gravity waves, you know, those teeny tiny physical waves left over from the Big Bang with amplitudes the size of atomic particles. HEL-LOO!  So, apparently there CAN be ISOLATION where there is MOTION. I also submit as evidence all the testimony from users of vibration isolation devices on this thread. Have you NOT been paying attention?

It definitely seems that one of the biggest challenges is, as Geoff suggested, putting these ideas all together in a stable manner that doesn't raise components so much that they no longer fit in the rack. 

I’m glad you mentioned that, Todd, as one of the really big advantages of my "new style" cryo’d springs is their size, being only about 3/4" compressed in height. So they will Fit just about anywhere. You could even use them on submarines, one supposes, where space is a supreme issue. Hel-loo, US Navy! Are you listening? The other advantage of my mini springs that may not be obvious is that their lateral stability is greater than for larger springs, due to lower center of gravity when under load. Thus, they can be placed directly under components without all the trouble and expense and SPACE of having to place boards underneath the components as in the old days. My Promethean Base, for example, sorry no longer available, employed springs that were about 2 1/2" compressed height.