Based on a Youtube video by Grand Illusions (https://www.youtube.com/user/henders007), named Helicone (https://www.youtube.com/watch?v=nkmBLPHGp0E). The video doesn't show how it works, so I made my own version. A very interesting gadget.
Modeled with Solidworks 2015.
Rendered with Simlab Composer 6 Mechanical Edition.
Video at https://youtu.be/vvjeeMnJyGg.