Or build a plywood box at least 6 inches deep and wide enough and long enough to accommodate your TT with a few inches to spare on all 4 sides. Then fill it with beach sand. Then sit your TT on a slab of wood, any wood, that is resting on the surface of the sand. If that doesn’t kill your problem, put springs under the sandbox.
Turntable Isolation
Im looking for an isolation base for my VPI Signature 21. My listening room is over my garage and a times my footfalls cause the table to skip. What have you used that works?