RickI, another side effect of that shackle: The opening where the pin goes through is larger in diameter than the shackle hook itself. So, when the shack opens, the chicken loop which is pulled tight like a U shape around the shackle, will not slide off the hook. It gets caught on the wider part where the pin goes through. I would have never believed this if I hadn't seen it with my own eyes.

So, that shackle will still not release the kite even when opened... Scott has been using these for so long it's almost instinctive for him to punch it once to make it slip off. Keep in mind it's only his backup not his primary release. most of us don't even have a backup.