This is the rig I used to take the stereos and stereovideo from my last entry. It consists of:
• 150mm arca-swiss dual dovetail rail (amazon) for stability
• two cell-phone tripod mount adapters (amazon)
• 4x4 inch first surface mirror
• two D-ring 1/4-inch screws
This uses only the clamp portion of the phone holders, which conveniently have their own 1/4" sockets. However, both parts of the holder(s) could be used for added height. The phone and mirror are angled 90º from each other, with the mirror edge very close to the camera lens, as you can see. The mirror-holder pouch in the 4th shot was a thoughtfully commissioned birthday gift I received :)
The 5th shot here is just for fun, with the catadioptric stereo-in-progress edited to be (un-)reflected and in 3D, albeit distorted.
In total, not counting the phone, it’s under $40 of components to effectively transform my cameraphone into a stereocamera / stereovideocamera, which is pretty impressive! Of course, these parts are specific for my phone. If you are interested in building a similar rig, I recommend playing around with catadioptric stereos with a handheld mirror first (see the tutorials), to see what size mirror and which position and angle works for your camera and lens.
UPDATE: I added more shots without the phone and mirror, for clarity. The taller holder is for the mirror; the shorter is for the phone; note they are angled perpendicular to each other, as can be readily seen from above.
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