[G6Tanuki]

What's the wire made of?

If it's steel or - even worse - stainless-steel - you will have problems getting ordinary solder to adhere to it.

[When I re-strung the dial drive on my Eddystone 840A rather than using any kind of solder I dismantled a bunch of 5-amp 'choc-block' connectors and sawed each of the barrels in half to produce a single-screw version; these worked just fine and have the advantage that you can release-and-retighten them if you need to take up a bit of slack]