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[katy]

You can soften hard drawn copper by heating it up red hot and cooling it in water. I do it quite often when I am running pipes in weird places.

You can also soften hard drawn copper by heating it up red hot and just letting it air cool.

[mwmkravchenko]

You can also soften hard drawn copper by heating it up red hot and just letting it air cool.

Yep. I have done that in a pinch when I have all the house water off during a renovation. You make a bit of a mess when you burn off all the varnish or whatever the coating on the copper is. But it is indeed soft. Lets you do some interesting bends when you are in weird to work in areas.

I looked at the video above. He is missing the round part near the end of the swaging tool to keep everything concentric. The swage has to be pretty near the diameter of a 5/8ths inch bolt.