Bondamp, various thicknesses and durometers (softness) of sorbothane sheets can be purchased at resaonable prices from Mcmaster.com.
I used a few stacked pieces of 1/8" sorbothane to level my turntable when the adjustment of the footers was not sufficient. I recommend 50 durometer or harder. Anything softer will deform if too many layers are stacked.
Mcmaster.com calls the material soft polyurethane rather than sorbothane, but a search for sorbothane will return the correct catalog page.
I used a few stacked pieces of 1/8" sorbothane to level my turntable when the adjustment of the footers was not sufficient. I recommend 50 durometer or harder. Anything softer will deform if too many layers are stacked.
Mcmaster.com calls the material soft polyurethane rather than sorbothane, but a search for sorbothane will return the correct catalog page.

