PaulyThis is a bout the best i can do, hopefully you can see the two flexible bulges either side of the internal opening, these contact the phone and hold it in place, i use an iphone 13 pro in a chunky case and its a tight fit
I would say internal depth is 25mm max around the point of the grippers but you can see the taper on the unit so wider at the top and slimmer at the bottom, it wont go all the way in, i assume the grippers will soften a bit over time and may have a bit off 'give' in them but hard to say
Only plus point is the inner piece is the cheapest at just over a tenner so you could always buy just that piece and try it out ??
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Thanks so much for going out of your way to do this.
Gives me a much better idea..
I will as you say probably just order that bit in anyway to check..