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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.
Sergeant_Pluck-
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.
Veblen
Thanks for your reply, it was super helpful. I had those exact questions about the Fairlight mount and the Son rear light beam pattern.
I saw the framebuilders yesterday, and ended up sticking with the mudguard solution after talking with them. On their own bikes, they tend to mount it at the dropout, for the same reasons as Fairlight, i.e. it's compatible with all configurations. However, they tend to use Supernova rear lights - whose beam pattern is apparently better for vertical mounting -. As I have an Edelux at the front, using a Supernova for the rear light would mean loosing the standlight function, which I'm not keen to do.
I also hadn't realised how big an area brazing damages : adding braze-ons or holes to have some sort of clean routing towards position n°3 would have meant repainting the whole seattube.
@Five-Hats : I'm going to use a Son coaxial connector between the BB and the mudguard, to make mudguard removal easy. I assume that's what you meant?
@Julien1A : I've heard of that, but I'm not sure it changes much : Son coax is a single "wire".