(it was adapted from the Juice Jug Rig wiki page)
We'll be using 1 gallon Tropicana orange juice jugs
These are strong enough to protect the cameras, and long enough so that the lenses won't hit the ground if the whole thing drops.
They're also made of softer plastic which is easy to cut. They look ripe for decoration and it's healthier to guzzle a gallon of orange juice than Coca-Cola.
This uses a T-bracket with 1/4" holes to hold two cameras side by side -- they're attached on using short 1/4" x 20 (thread) bolts, though I used some with knurled caps to make them easy to tighten.
Start by slicing the bottom off of a 1 gallon Tropicana orange juice jug
Holding the rig upside down, lower the cameras into the bottom until they rest against the "shelf" formed by the handle.
Pull the tether string out through the mouth of the jug and, holding it taut, close the jar over the string. Center the string so that the jug hangs without tilting to one side.
The jug should be sturdy, but if you're worried, you can tie a second tether around the handle. Just don't stop the first tether from hanging straight or the whole rig will tilt to one side.
Be sure the camera lenses are recessed enough that if the whole thing hits the ground, they'll be out of danger. Try extending the lenses to check.
Ready to go
Swing it around a bit to check, and you're ready to go!