Quadlock to 1/4" stativ adaptor
Use stativ or other mount for filming with you phone.
I'm using this adapter to hold my phone outside glass door of infra sauna for movie playback with suction cup mount.
You will need one imperial 1/4" nut to insert into model cavity.
Quadlock side is based on model by https://www.thingiverse.com/thing:2833058/files
Model available on Onshape: https://cad.onshape.com/documents/d8113bf2da2085d7d0014d48/w/287497ed57e7941268d42e2c/e/e5797a572f3acb834c027922