It will stay locked fine, but when you want to drop your spin, if you stop the halyard going out, by sitting on it or if it get wrapped around your foot or something, the spin lock will lock down again when the halyard is tensioned, at least that's what mine always did. And later, when it wouldn't hold the spin up, I found the casting was cracked under the axel that it rotates on, so everything looked fine until you put a load on it, then it would slowly open up and allow the halyard to slip down. Either way, I like the simplicity of the Harken cam-cleats when it comes to spin halyards. They have been pretty much idiot proof in my experience.