I did try it when it was off my wrist, to see how it would feel. I tried unlocking it as well, just to see where the screw would end up. I wasn't sure if that was how the screw looked or if it was broken, but mine does look like that as well. I put it back on and this time I did hear/feel a click, and I've tried tugging on it to see if it would come apart, and it does not. I hate to say it, but I did try to tug it as hard as possible and it still doesn't come apart. I'm gonna give it another go, and if it falls off again, I'm definitely going to send to Cartier to fix. Because at this point, I don't think it's user error. Thanks for the pic, it really helped.