Sometimes these have those old quick release bars installed - they are a major pain in the arse. If that's what's in these, you have to find the little "handle" on the bar (it often spins around away from the slot in the end link) and then use something to compress the handle like a small screwdriver.
I've had some that are so plugged up with dirt or seized so badly that I could only free them after running the case/bracelet through the ultrasonic tank (after removing the movement obviously).
I would definitely not recommend using a dremel - this will end in tears and borders on being reckless. If I have to cut one out I use a screw head slot file...
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