I didn't want to glue it so I screwed it onto the handle bar mount with some small screws and put a piece of duct tape over them to keep my phone case from getting scratched.
Update 10/5/24 intried this with my iPhone 16 Pro Max and it fits. Th doesn’t have as tight as a grip as my 13 pro max case had but the phone does slide in and out without issue. I am using a case I got from Amazon called “Lamicall Magnetic Case for iPhone 16 Pro Max, for Magsafe”.
I haven’t taken the 16 pro max for a ride on the bike yet but if I see any issues then I may adjust the model for a firmer grip.
The author remixed this model.
Resized phone plate file for “Sturdy Phone Mount for Mountain Bike” by vane_sander