Excellent post, @jetter. Are you as amused as I by how using springs for isolation is now all the rage here, when GK had been singing it’s praises for years and was completely ignored? (Not by I; I have both models of his springs under various components.). I guess he has no one to blame but himself for that, considering some of the other items he offers on his Machina Dynamica website.
Speaking of spring isolation: the Townshend Seismic line of products takes si to another level, but are considerably more expensive than simple springs. They too have been praised here on Audiogon, though GK posited that their damping function results in less isolation than bare springs. Those interested enough to investigate can easily find the Townshend Audio YouTube videos, wherein Max Townshend explains the theory behind and demonstrated the effectiveness of his Seismic Pod.