Turntable suggestions for a shaky wooden floor

No carpet I’m afraid it’s all hardwood. Thanks for the input all.

What benefit might there be to a large carpet with thick padding? This and a full size sofa were my first room treatment, but they predated the arrival of any of my components, so not sure how they changed the listening environment.  I know that this won't solve your vibration issue, but it might contribute to a solution.

I had the same problem when I moved to new home music room went from basement to 2end floor. I have a RP3 I removed the feet and replaced with Sorbothane Hemisphere Feet. from Amazon. Put springs under my sub’s and the problem was fixed. 

wall  shelf is what you need

SOTA, Sapphire and above. Had the same issues, SOTA cured all, and a great performer. Unfortunately new, out of your range, but maybe not used….depending.