I use a toothpick to depress the button.. when I reinsert the pin the button may need to be depressed again.. as Ubi says it needs to pop back flush with the bracelet.. if it doesn't "poke" at the button with the tooth pick.. or give it a tap with your finger from the outside of the bracelet.. that usually releases it from the open position.. but I use loctite "bolt" fastener on the pins in my reps.. just to be on the safe side..
The DSSd especially, with the weight of the case the pins get loose easily..
AC/L