For my iPhone 6 to use this mount, I had to off set the platform. I also had to design an adapter ring for my eyepiece This one has an ID of 28mm.
The original design is 4 years old so its not surprising that phone shapes have moved on, I hope this alteration gives the original design a little more life.
I don't show the clamping parts in this image as I'm still waiting for the fixing screws.
I used 50% infil for strength