Rubberband gripsystem mobileholder with gopro universal mount

Got tired of all manual locksystems, so decided I wanted to create my own with spring or rubberband. Could not find any springs, so my choise fell on rubberbands.
Choose to make it compatible with the gopro system as its very flexible.

The Gopro part I got from a friend, but the rest is my own design. I have to admit I got some design-ideas from other projects and other people, but this is the result of my own design and idea.

Let me know if you have any comment :)