Aurios and Tungsten balls

You will have one of the best isolation devices when you get the balls centered. Their is a very small depression in the center of the screw that holds the Aurios together. I use 7/16 tungsten carbide balls and find that if you are careful they will stay in that depression. You will, however, have to have a level shelf to use the early Aurios. I have never done it, but you might super glue them once in place.

Listener57, yes use them upside down. It make no difference in the performance of the Aurios. If you want tungsten carbide balls, which I strongly recommend, I know of nowhere cheaper than McMasters/Carr, at least if you can get them at wholesale prices there. This usually means buying them in quantity. I bought 56 balls.

Mitchb, the ProAurios and the newer Aurios have a large depression or hole where larger balls will not so easily come out. I do find, however, that the old 1.0s outperform the newer Aurios as the race depression is shallower. This means they are very sensitive to a level surface and that they are freer to move if need be. You can with a level surface use the balls, but you have to be very careful. If you can, remove the unit place the Aurios with balls and carefully lower the unit into place.
I have not tried it yet but since the balls don't move, you might superglue them into place.