It is used for the speaker box placed on the floor. Since strengthening the bass makes the floor resonate, I used it as a foot for vibration proofing and soundproofing. Since it is a British made speaker, there was originally M6 's insulator mounting hole and it just snapped. Resonance was also gone and sufficient effect was obtained. It became an alternative to expensive insulators.
A portable compressor of a first-class maker purchased about 30 years ago has only a poor sleeve-shaped vibration damping rubber on the frame base surface, and when driving the compressor on the concrete floor surface, the compressor unexpectedly Although I was using it while moving or fixing it with a rope, I installed a hole in this base of 4 rubber vibration isolators. Pitat is stopping. I thought that I could get it sooner.