Standard ball mount size?

Looked everywhere with no results. I have a Spotlight Camera Plus which needs a little extension to see the direction i need it to on side of house. Does anyone know the right size of the ball on the factory mount? Im guessing it’s close to 20mm, but cant verify that exactly. Was hoping a pro would know on here.
Thanks for any help!

Hi @RKP. When you say the Spotlight Cam needs an extension to see the direction you want, could you clarify what you mean here? If you need your Spotlight Cam to look over a different side of the house than the one you’re installing it on, I’d recommend reconsidering the installation location.