[Radio Wrangler]

The simple medium activity flux in multicore solder is pretty good unless you're tackling something awkward like nickel plate or tarnished metal. But injecting the solder onto a heated joint works well. If you try to transfer the necessary solder via the iron, the flux will have gone by the time the iron gets there.

I do most of my soldering under a microscope these days (well, components have got smaller, that's my excuse) and my favourite scope is a Russian stereo one originally developed for metallurgy. You can see the grain in a dodgy joint and it doesn't half cause you to up your standards!

David