Yup strap wrenchs can even use the chain style from auto parts for oil filters
You'll have to give more details, but possibly tack glue the coupling in place on one side, or use a union instead, or belt style wrench, or take pipe tape for a tight dry fit, or create a jig out of plywood, I think we need more info.
I need two hands available and my piece is about 3-4 inches long. Just a tube. I don't want to damage the outside though.
Just use two clamps on it to stabilize it, your normal f-style would be fine
Pics.
I have made tools like I think you're describing, not sure what size pipe you're working with.
I cut the jaws out of a vice grip and welded a short section of pipe that I cut lengthwise to where the jaws had been
to make two half round jaws.
I modified a couple of channel lock type pliers by doing the same.
If you have access to a welder and metal cutting tools, it's not a big project.
You could line the pipe pieces with a grippy rubber material if necessary.
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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