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For some reason I cannot post pics, they wont upload to the server so I cant select them.

The way Aurios work is with 3 ball bearings rolling inside a round chanel, something like an inverted doughnut...top and bottom.
On the center they have a bolt that allows for some movement but wont let the whole contraption get dismanteled, in case, lets say, of a big hit on the side.  Each ball bearing is held in place by a thin plastic circle that hold the bearings in a triangle shape.

The main thing is they work very nice and slide sideways with a lot of ease.
There is no way they will damage the bottom plate of any piece of equipment, imho.
They couple to the shelf, with a big area and some felt, and to the equipment on top with a ball bearing: I have used a small brass cone here and heard no change.


I dont use the sand inside the posts that make up my rack,  I could, but I see no need just yet.I used pretty thick material.

Each shelf of the rack is supported by something like a sand box, with a lot of area and about one inch deep of sand, 
each shelve has its own sand box: this gets rid of a lot of vibrations.  Let say Each shelf couples to the rack via sand.
The easiest and fastest way for me to do it, was to use Plywood shelves,  I know, not my first choice.
The idea was to use them temporarily untill I ordered some Marble or Granite shelves cut to size.
I havent got around to ordering the heavy shelves...

For my TT I use a 2 inch slab of Maple, I detach it from the shelf with Sorbothane, and form the TT plinth with Brass cones.
It works pretty good and it is still sensitive to added weight on top.   If I jumpt right next to the rack I will hear a thump if the record is playing.
My listening room is made of brick and mortar with concrete floors.

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