That's a great looking set up Eric!!!
I just made a set of rings for my GS 12" and I went to Clark Rubber and got the right thickness of rubber strips and lined mine. Geoff and Vingo suggested I use felt but I don't need to rotate mine.
If you go to Clark Rubber ask to see the range of the rolls of Sticky-Backed rubber strip. Different thicknesses, different widths. Just peel the backing paper off and stick it on
