So, progress report.
I had to disassemble rotary potentiometer for radio, as it was glued down with the same lubricant. I thought radio was not working due to loose rope.
Upon a closer inspection of the previous part I was talking about, I found out it has no plastic bits. Its a different color metal, which felt like plastic because of layer of the hardened lubricant stuck on it.
I took all and pot it into a cleaning solution I often use for various purposes and have laying around in garage. Potentiometer is close to being restored after couple hours of leaving it, but the needle lowering mechanism is still stuck. I will leave it overnight and see the result.
Anyways, After cleaning everything while it is disassembled, Im getting towards end of this rather easy restoration.

Everything seems to work properly.
I have a slight issue with blown light bulbs. Again, I never saw this type of light bulb, so Im gonna ask you guys where to look for a replacement.
Im sorry, I have no information about the light bulbs other than a photo. Once I throw everything back together, I can measure on what voltage they run and etc.
Thank you for help and patience.
