I’ll get some other pics up at some point, but if I forget it wont be for 10 days or so.
Current iteration is solid. I’ve had to modify the case back slightly so that the metal washer sits underneath with the screw head. This has produced a slight “bow” on the case, and it applies some pressure to the battery. Don’t believe that there are any issues with this.
Have had occasional rotation of the phone around the screw, but only when knocked and not while riding. Did some pretty hardcore descents yesterday and had no problems at all. Was also caught in rain, again no issues.
I think the important thing is finding the right screw, I have used a PC fan screw which was slightly long so trimmed it down. These screws are designed to cut their own thread into plastic and suit this application nicely.