Gentlepeople.
The debate between those that like compliant type supports and those that go for the hard supports has raged on forever. My view is that if you have a suitably still shelf, hard is the way to go. From reading here it seems that those that prefer hard supports make them all out of the same material. I believe that this arrangement can be improved, if your goal is to wick energy out of the TT structure. By using, say, three identical hard feet you are creating multiple paths to the shelf (ground). This is the electrical equivalent of an earth loop. I have experimented with identical and dissimilar feet on my TT and have settled with one fixed using a tungsten carbide ball, and two adjustable using large PVC discs. The PVC discs are softer than the plinth material and in theory tend to slow and impede transmission. The single TG ball is fast and creates one clean path to ground.
Just another view on things.
The debate between those that like compliant type supports and those that go for the hard supports has raged on forever. My view is that if you have a suitably still shelf, hard is the way to go. From reading here it seems that those that prefer hard supports make them all out of the same material. I believe that this arrangement can be improved, if your goal is to wick energy out of the TT structure. By using, say, three identical hard feet you are creating multiple paths to the shelf (ground). This is the electrical equivalent of an earth loop. I have experimented with identical and dissimilar feet on my TT and have settled with one fixed using a tungsten carbide ball, and two adjustable using large PVC discs. The PVC discs are softer than the plinth material and in theory tend to slow and impede transmission. The single TG ball is fast and creates one clean path to ground.
Just another view on things.