Another idea: 1. Buy a hard-back slim case like this one: https://www.apple.com/shop/product/MWYK2ZM/A/iphone-11-pro-clear-case 2. Cut off ¼ inch from the top so it can slide up and down (and modify the button holes) 3. Mark the point where the bottom of the phone needs to be to make the 13mm lens miss the Movi motor. 4. Add Freefly counterweights. Other threads say the new weight system is very good. Downside: This all ads up to a bit of cash, so you'd only want to do this if you expect to use the iPhone 11 Pro on a Movi often. Even if you can use the 13mm hand held, it might be handier to keep the iPhone mounted in the Movi so you can switch lenses quickly.