Small problem with the original idea.
Sure it works, but using
metal screws for the cameras and metal clamps to attach them to the
stand, left the whole thing heavy. Too heavy for the specifications of
the plane.
Time to innovate! Easiest and lightest thing would be
to attach another pair of bigger tubes over existing ones, using them as
tracks to hold the cameras while still being able to adjust them.
Fresh out of those, we make our own:
Wrap some shrink wrap around the tubes, to use them as a mold:
Wrap some strong fabric around the mold. In this case, polyester canvas fabric. And drench it in super glue.
Let it dry and then pull off the mold carefully.
Sand off imperfections until smooth.
Cut to equal lengths, drill holes for camera holder and spaces. Reuse
parts from previous version, but cut away anything unnecessary to keep
the weight down.
Again wrap the stand in shrink wrap, put on all the parts and drench it in super glue again.
Replace the metal screw with a plastic one.
And we're done!
In previous version, a single camera holder was
73 grams, this version is 14 grams. Altogether a reduction in weight by
118 grams (118 = 2*73 - 2*14).