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Isolating CDP from weak wood floor

My CDP skips (alot) when my 25lb son dances on the wood floor in front of it (weak joists). I have a solid Manna rack and use MIB bearings under the CDP, but there is really no up/down isolation. I've also tried nothing, bubble wrap and some thick rubber/cork feet--no dice. I just looked at some Solid-Tech discs of silence, which seem like they might work-http://solid-tech.net/isolator.htm. Before I shell out the $$, I thought I'd see if anyone else has faced this problem. Thanks. D
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disc OP
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Thanks for the quick turnaround everyone. I appreciate it. In the interests of full disclosure, I need to redo my foundation entirely and re-sister (as they already have been sistered) the joists. My dirt floor basement looks like a convention of drunken screwjacks, standing only because they're nailed to 2x4s. But there are none on the joists under the stereo. Might be time to shift some of the stereo fund to the house fund. I'm going to try the artgum idea and the screwjacks. GSM, I'm holding your solution in reserve.

I really appreciate the help and will report back.
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