iPhone 6 RBS Train Seat Backrest Clip

I have a 40 minute train ride to commute to work every day and I wanted a way to mount my iPhone 6 to the backrest of the seat in front of me so I could watch stuff without having to hold the phone. So I created a holder that clips on the phone and slides in the little gap between the frame and the cushion in the backrest of the seat in front of me.

This is customized for my own phone with a thin 0.3mm case - so I added 1mm to the width - and the backrest of an RBS train in Bern, Switzerland.