Cheese plate for Kandao Obsidian to provide extra mounting points at the top of the camera for extra stabilisation or for additional equipmnet.
It utilises the existing battery cover. All you need is a M3 x 12mm machine screw and a 1/4" x 1/2" machine screw for the H2N.
Alternative version with extra 1/4" threads at the top...
https://www.shapeways.com/product/UAZT84G6X