You just need a clamp that has a v shape instead of being flat. It gives 4 points of contact and is super stable. There are vise grips made this way but an actual vise is best. You could maybe use a set of adjustable pliers and tape the handles together as tight as possible. I don't know how sturdy you need it.
Ahh that was the key word I was looking for V-Shape I'm getting all kinds of options now. I didn't know they made them like this. Pretty cool. Thanks I think I'll be good now. https://i.ebayimg.com/images/g/8oAAAOSwVQ5f9bjh/s-l1600.jpg
You got it. I've use that clamp to thread metal pipe more times than I can count. Good luck to you and your project.
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