10-11-2018 11:58 PM
IMO, it's best to just have a second protective lens on hand in case yours gets scratched or dinged. Pretty much the whole purpose of the protective lens is to not only protect the main lens, but also to allow you to replace it in case of damage. Pull and twist counter clockwise and it will pop off.
That being said, I actually have two extra protective lens (one for my HERO5 and one for my HERO6) that are still in their boxes. I'm not going to get a third for my HERO7 Black since I have these. I can be pretty rough on my cameras but over the last few years, I still haven't needed to replace the protective lenses. Still glad that I have them, you never know what might happen, but I could have saved some money and just purchased the one.