As you can see the armband's button was secured by 4 plastic ribs which stick out from the post. The ribs on the post and the profile of the ring act like a wedge, temporarily deforming plastic to allow you to close and latch the button. But, once latched, the slope you would have to work against to unlatch is very steep. So, the button is easy to close but very hard to open via pulling.
In order to open the button less destructively, a pipe is needed, to go in the slot between the post and ring and . Finding a pipe of the right diameter and thickness would be difficult. So, I took a sheet of aluminum, cut a small piece, and shaped it onto a pipe using a suitably sized wire and pliers. Such aluminum can be easily be cut by scissors, though you probably shouldn't use good scissors which you want to keep sharp. Once I made the pipe, I adjusted it, making it a bit smaller by cutting a tiny sliver with scissors to reduce circumference and again shaping with pliers. Then I forced the pipe into the gap between the ring and core.
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