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The original Libra buttons have the switches under the outer curved ends and the flexi-hinge joins the pair at the middle. I imagine all kobos with buttons are like that. Under are the low profile "tact" switches everyone uses that use actual switches. Cheaper solutions are the clicky metal dome on the PCB or a conductive pad to the PCB (most remote controls and very cheap calculators, but oddly some expensive two-way radios).
Hence you'll wear out the hinge if you press at the centre instead of the curved end.
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