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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

RE: if the shelf and equipment weigh 30lbs. The tip of the spike is loaded to maybe 10,000 ib/square inch

I agree with you, up to a point (if you will pardon my pun).
The floor or shelf will have vibrational nodes, just like any other object. If you can position the tiptoes supporting the item you want to isolate such that they are in contact with a point on the surface of the floor or shelf that does not move when the floor or shelf is excited by some other external force, then you can achieve the diodic effect claimed for tiptoe-like feet. The energy can drain into the floor or shelf, and very little energy wants to flow back up into the tiptoe.

You can find the nodes, sometimes, with a stethoscope.

To the OP, gravity has NOTHING to do with this.

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