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I used some circuit board pins and jumpers to make very discreet connectors, but they don't hold together very well. I was planning to browse the CPC Farnell catalogue soon to see what banana/spade plugs could be had at a reasonable price.
The wire that came with my dynamo is pretty thin, so audio cable should be fine.
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Bingo. If you're still after connectors, here are some ones identical to Supernova's bananas, for peanuts.
I need to lengthen my Dynamos cable. Figure the easiest way will be to add a connector to make the light removable, rather than disassembling the light and soldering a new wire in. Supernova's gold connectors are a silly price - is it worth spending more than a couple of pounds on spade connectors from Maplins? and is two core audio cable okay to use?