I like the idea of not having to change the whole chain as mine still worked. It was only broken in the key ring hole. I had a small problem: at first it didn't work. I had to open it up and cut out the left circle of the button (on the right side seen from the front) where the button wasn't. By cutting out this part it was possible to connect the electronics. Attached is a picture of what I had to cut out. Hope that helps.
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