If you have the HP's there, then I can only suggest you try to take a look at one of them to see what I mean. The lock is a small plastic slide tab that is difficult to engage in the first place, and once engaged, only puts what seems to be a small anti-fold resistance on the top side of the keyboard [even under light pressure, the keyboard will still flex about 5 degrees]. Even when working, it just doesn't feel secure. And I have seen more than one broken demo in the shops [though sometimes it is the gears which regulate the opening of the two halves which seem like they have gotten out of sync].

And of course, the HP is not hid.