This is a remix of: http://www.thingiverse.com/thing:92014
I redesigned the adapter plate with screw pattern for the DJI Phantom 2. It's otherwise, the same deal.
I use this with my dual Kodak SP-360s. It's a bit shaky for me. I should try stiffer o-rings.
Connect middle part to the rim using o-rings - adjust stiffness using different kind of o-rings.
You can also place two additional big o-rings around middle part to hold it firmly in place.
It is designed for use with GoPro in water-proof case and will break on impact - keeping mounts and frame from breaking.
Use at your own risk.