A very thoughtful solution for Hero 8 Black. Fits well, just wobbles, I don't like the pin to close the access door. Difficult to coordinate fingers to open. The sealing of the chamber was also broken. Tried putting the original door back in place but couldn't close the frame, too much foam inside, felt like something would break if you squeezed it. Great ways to attach accessories. The mount pins are slightly loose and flex on the mount, so only a 1/4-20 adapter needs to be used.