I agree with Jake. I have several and I bet that if I checked them today, only 2 would work. The 2 that would work, have the hook pinned in place. These are simple pins, no QR or detent balls. On one, the top of the pin has Velcro over it and on the other the pin is slightly bent with the ring at the top held out of the way with 1/8 bungee. The last one is a older, modified version of the Magic Marine in this post.