I wonder why no one has suggested the "Heat Shrink Tubing" thing? If you can use it to make a welded loop on the end, I'm sure t would would work to mend a small nick. You just need to get a small piece of 2mm electrical heat shrink tubing, slide it over the nick, heat it with a soldering iron (held an inch or so away, by no means ever touch the line or tubing with it), and after a few seconds(ok, maybe a minute), just roll the gummy tubing off to reveal a (hopefully) mended line..............................Or you could just cut off the first section where the nick is Don't forget to seal the end up with some pliobond to keep it floating high. Good luck