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Oh, believe me, I know about coax cables ;) This is why I wrote "wire" in quotes.
I'm also familiar with what @Julien1A alluded to, though :
1°) I've always heard it was a fairly unreliable method to replace the neutral wire.
2°) I don't want to bother with that because it wouldn't make it cleaner than using a single SON coax cable.I really like the cleanliness of SON's coax connectors, the crimped connectors look very unsightly in comparison. I'm confident enough in my soldering abilities to use them, we'll see how it'll turn out. But first, I need to put my hands on a pair of connectors.
Julien1A’s post refers to using the frame as one conductor (with the light body being grounded to the frame) and a single wire as the other.
SON coaxial contains 2 conductors - the central wire surrounded by an insulator, and the ground wire wrapped around that in a spiral.
Adding the SON coaxial connectors requires soldering, and personally I found them fiddly little bastards but had no choice but to use them at the hub, so I could use the connection block, and to allow my charger to connect to the female coaxial connector as fitted on my Edelux. Elsewhere, I think crimped connectors are a better job.