Today I finally recapped the Eico 379 that K gave me. I cut the old axial electrolytics out, and soldered in (hook and loop style) some new radial electrolytics. As you can see, the leads needed to be extended. When I need wire to do that I use the wires inside thermostat wire. You can buy 7-conductor versions, so if you need color coding, you'll' have 7 colors.
All of the transistors have lots of black corrosion on the leads, so I will replace all of them.