Season 2 Ep43. Jack is trying to tin a couple wires. The first thing you learn about soldering is you always heat the joint or wire and then apply the solder. If you're holding some wire, and the iron, you need a third hand. An engineer might use his teeth in a tight situation, but usually you'd plonk the reel of solder somewhere convenient, with a few centimeters hanging in the air, and offer the hot wires to the solder. Whichever method you use, you need solder. And you never melt solder onto the iron, then apply to the wire. That just doesn't work. Now, I'd expect Jack to know this. So where's the reel of solder?