I was working on a 1952 Twenty Grand, called Steve Young looking for a new skirt, and he told me about the brad nail mod. I used a very small drill bit, just under sized of the nail. Worked great.

Don't think he has the graphite rings any longer. But someone, maybe Steve, suggested just tightening the copper circle that holds the rings. For home use, that should last for years. Then just get new copper wire when it needs replacing.

If you do rotate them, be very careful. They are very brittle. I had two spares, and broke one installing it. Felt like I had broken the last dinosaur egg on earth. LOL

I also saw on another post in Pinside, someone who had made one out of a brass knurled hand turn nut. He drilled out the center threads and enlarged the hole.

Brass is very conductive. Think it was the original metal for many old light bulbs.