I've got a few NES AC adapters that simply do not work at all. On some it's obvious that the cord is the problem but on others the cord appears fine. Is it possible to fix them? By the way, here's a great way I came up with for checking for nicks in the insulation of a cord. Take a damp small towel, wrap it around the cord and run it along the length of it. If there's any nicks, even small ones, the towel will catch on them and you'll feel it.