Didn't work the pencil solution, but thanks for the idea! Had to try.

I'm waiting for the copper foil. It will take a looong time (more than a month, I guess), because it's comming from China. I'll post here the test results.

 

I'm waiting for the copper foil. It will take a looong time (more than a month, I guess),

If you don't want to wait, do you have a craft store nearby? Many sell stained glass supplies and carry the copper foil tape. Just one of many - https://www.hobbylobby.com/Crafts-H...per-Stained-Glass-Foiling-Tape---1-4"/p/21964 After it is put on the glass edges, they then solder it so it should take soldering heat in your application.

 

Thanks! But can't access to that web. Anyway, they may have even in Tenerife or something, but paying a lot more and I'm not in a hurry. A friend in Madrid received a replacement from an old unit (from some guy that is selling the same turntable by parts on eBay), so I'll have a solution in one way or another, and can use another turntable at the moment.

 

If you don't want to wait, do you have a craft store nearby? Many sell stained glass supplies and carry the copper foil tape. Just one of many - https://www.hobbylobby.com/Crafts-Hobbies/Glass-Crafting/Stained-Glass-Tools/Copper-Stained-Glass-Foiling-Tape---1-4"/p/21964 After it is put on the glass edges, they then solder it so it should take soldering heat in your application.

Or more simply,take a bare PCB and pull some the copper laminate from the substrate, e.g. FR4.

 

With clamp-on connections, even aluminium kitchen foil might be worth a try?

 

If somewhere along a carbon trace; when all attempts fail, use a soft pencil to deposit some carbon...

Didn't work, but had to try, thanks! (Would be awesome)

With clamp-on connections,

Could you post a photo? Can't say what kind of clamps you mean (they can't be "that in 3D" because the frame).

Tested with the copper coil. Great conductor, but have about 3 KΩ between the copper and the rail. Any ideas?





If not, in the future when I visit Madrid, maybe I could ask someone for applying some (good) silver ink? What kind of professionals could work with it? Aw, so close, but still so far...

 

Could you post a photo? Can't say what kind of clamps you mean

It was just a concept, so no photo. I envisaged something thin and springy holding the foil in place.

about 3 KΩ between the copper and the rail. Any ideas?

Is the foil held in place by adhesive?

 

100% conductive (0Ω)

?
https://phys.org/news/2017-12-physicists-temperature-carbon-nanotubes-superconductors.html