Does anyone have an idea for some DIY isolation feet (or something i could easily find at a hardware store maybe?) I could use for a Quickie? I put Herbie's tube dampers on the preamp and that gets rid of most of the ringing (and improved the sound a lot), but i'm looking to get rid of vibration transmission from closing my turntable cover or tapping the rack surface to the Quickie. The tiny silicon feet i'm currently using (only a few mm thick) aren't doing the trick. Thoughts?