A new derailleur cable is about 3 dollars. It isn't 3:00 am Sunday morning and the guy is in Seattle! You can't spill a latte without hitting a bike shop.
But the only thing you can do if you fuck up a cable is to trim it back and when you run out of length, you have to replace it. Sort of like asking how to fix a light bulb filament. Hey I don't make the rules.
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