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Thanks! On the Supernova lights, at least, the two insulated wires for each run (one to the hub, one to the rear) are in a thicker outer jacket, so in the case of the rear you just strip some of that off, cut the inners to differing lengths, crimp them to the rear wires and cover the joint with heat shrink. Nice and simple. You could do much the same with any light guage two-core wire to make a new run, I'm sure.
Dynamo wiring first of course.