That just looks like a stop to me, no locking function evident. There is no load on the strap, so your cam is not engaged. Not sure how that would effect it, I will check tonight as well. If that is a better way I sure do want to do it. Thanks. Philip.
If you look at them when they are "open" like you had them you are relying on a little spring to hold pressure to keep it locked. When you "close" them the handle locks it so if the spring would break it will hold itself like the one I have pictured. Your straps are made like mine and have this safety feature.