FS - Free Spring series present vibration isolation for base mounted that installed on ground or base. These open spring isolators compress on neoprene cups and soak up lower and higher frequency vibrations. Resolution: Isolate Equipment Inertia base with spring sort isolators – The addition of mass to the bottom https://vibration-isolation-inert14679.humor-blog.com/38038725/the-2-minute-rule-for-concrete-filled-inertia-base-for-vibration-isolation