V2 is up! More rigid and simple! you will need a 1/4 - 20 HHCS x 1" LG (regular bolt!) and a nut to match
This thing (Red thing) slides into the hot-shoe (flash mount) on a camera and gives a place to mount another camera or cellphone mount of your choice.
I needed to film a video of a group fitness class for a new instructor who will use the video for final evaluation for certification. I wanted a cellphone video as backup!
You may need to scale this up by 2540x Basic conversion from MM to Inches. AutoCAD 2018 seems to export a little differently than the last version
Note I haven't found the thing (white thing) here on thingiverse yet, but will give credit when I do.