Soldering 4MM Plugs

I keep forgetting that there is soldering stuff out there for something other than electronics. When you get your soldering supplies, don't get them at the hardware store. Most of that stuff is geared toward soldering copper pipe. For most fine soldering, I use a flux pen that I got from either circuitspecialists or digikey, I don't remember which. I also like to use silver solder. It works very well and is strong.