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A raised floor will not work, unless you can somehow mount the floor so it don't touch the concrete.. If it is touching, you'll still get the vibes...

I say go for the cut, all 4 sides. Sacrifice the conduit...

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That was pretty much my thinking.

By the way, before I go nuts and start cutting the floor of my dome apart, any suggestions for an absolutely certain test? I am pretty convinced this is the problem - but who knows - maybe I'm mistaken. I guess I'll need something that sets up high frequency vibrations in the floor that I can switch on and off pretty easily. Or is there an easy way to measure the vibration of the pier itself?

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