Videosphere polishing and TV tuner

Progress with the cleaning of the Videosphere is as follows:
Have purchased some buffing/polishing compound that is supposed to be very good for plastics, it is called Polac (but also goes by the name Vonax).
Purchased from Abrasiflex for $24.20. It can be purchased cheaper from Ferrofin but are in the eastern states. Whilst this is fairly expensive, it was a very large bar.

I already owned a cloth polishing disc 3.5″ disc which I attached to an electric drill, and then secured to a bench vice.

This has become my makeshift polishing wheel.

After much experimenting and much wasting of time, I have come to method that produces satisfactory polishing results.

1. Sand with wet & dry 320/400 grade paper any deep scratches.
2. Move to 600 grade wet & dry all over the plastic
3. Move to 1200 grade wet & dry all over
4. Finally finish by buffing with Polac all over. Abasiflex recommended dry buffing.

Pictures of one half using this procedure below, I will buff it more later.

I have started looking at how the tuning was achieved on the Videosphere, I have realised it is impossible for me to use the existing tuners. Below are pictures of the VHF and UHF tuners. It was quite intriguing looking at technology that was over 30 years old.