Yup, have several and like them, on my
current boat and my last boat. Really lower the AC load.
I believe Boat
Galley reported dropping a wrench from the masthead on one, where it saved the lens. I have one that I am prone to resting a secondary
anchor on when I pull it out of the locker. They can take a licking.
You can unlock the twist thing by rotating a foot. One of mine is near the
mast. But it never came off (there are 4
latches on those).