Sometimes you need to isolate your holographic lasers from vibration or perhaps just your AC transformers and tubes on your home audio equipment. In either case, these Norborene (“Norsorex“) Stabilizing Spheres, also known as the “Happy Unhappy Balls“, are a fantastic deal. For $35 you get a package of 15 and if you cut them in halves that makes 30 hemispherical feet (that’s maths).
On a related note, still having to do with polymers and rubber, one of our toilet tanks had a fiddly flapper, I think this is the technical term, where you’d have to jiggle the handle to stop the tank from running. The solution was a “Korky Plus Premium Universal Flapper” and it works like a champion.