what i am going to use to try and isolate vibration are dock bumpers.
the rubber elongated pyramidal shaped rubber things they bolt to the rear of trucks and trailers so that they have a cushion when backing into a loading dock.
they come on all sizes and shapes, and i would assume densities as well, are fairly inexpesive and easy to work with.
i figure on when my floor is poored having the contractor leave 4 pockets, so that i can move my get set in place, support it off the floor, so that the dock bumpers
sit down in the floor pockets, then grout them in place, let cure, and pull out the supports.
what i hope to have is a unit that is now sitting in nice fitting sockets, and nice isolation.
it is an experiment, i got the dock bumpers surplus for 2 bucks each, so i guess we shall see
bob g