This is not only ykk though, many others have copied this system. Have you ever had your zipper all the way down with the tab lodged in the end of the V and you

This is not only ykk though, many others have copied this system. Have you ever had your zipper all the way down with the tab lodged in the end of the V and you can’t bring them up until you lift the tab from that hole? The lock is why