https://www.youtube.com/watch?v=AEL9PPXPqpc

That is absolutely incredible, interesting coating process and very very cool to see electrodes made. I wonder how they get the actual metal part of the electrodes made

Source material is pure soft iron tape, or nickel plated soft iron tape. Making a conical electrode from this is trivial - just a bit of stencil cutting and spot welding.

Solid metal electrode shells are easy too, made by pressing from soft iron, as it is ductile. Probably, nickel plated at next step, but here I am not sure. Ready made electrodes are still no problem to source.

Lovely video. I do think his hands now permanently glow under UVC light, lol

Hope those phosphors are somewhat compatible with life, considering the complete absence of PPE. Seems like he's not even using a dust mask.

The crude, violent bombarding process is also neat to see. Just a strip of paper on the glass to show the glass surface is above ~240 degrees C, charring the paper.

The awful part of this is that he makes it seem so easy to bend, seal and fuse bits of glass. I've tried it, it's not that easy...