Son is into retro video games, has a few old Nintendo cartridges that need the connectors re-plated. Looks like they were copper plated originally according to his research, so not sure if that is the best route to go with, or maybe go with gold plating? IIRC, you need nickel between copper and gold, correct?
Anyway, any good US sources for a not-crap-grade plating pen? We have a few DC power supply sources he can use, so just need the pen and a lead on solution if you have it.