[RichG]

Arran,
Thanks for the information. That link was very informative. I guess the posting is too old for the pictures to show up, I get a message that the content can't be loaded. But the written information was quite good. It was nice to know that I managed, somehow, to follow much the same procedures to make my disk. I used a compass with 2 points to score the plastic as deep as I could. Then used an xacto knife to score even deeper. Working carefully, I was able to break the plastic. Minor sanding to make it perfectly round. I used a brad point bit to drill the center hole because it has a small tip that will center into the dimple from my compass.
My plastic came from an old LED computer display, I think it is called the diffusion layer. It has tiny dots in it that diffuse the display lights. I figured the dots would diffuse the dial lights.
I was also concerned about the heat from the dial lights, but that doesn't seem to be an issue. I did clean out and lubricate the bearings in the tuning capacitor. I had to remove it anyway because the rubber mountings had disintegrated. I replaced them with rubber grommets. Now the friction drive is smoother with no skipping.
Rich