Advice to those weighing the benefits of purchasing a self-closing hinge versus a self-closing pin hinge: choose a complete hinge. but the device couldn't build enough voltage to close the door (plus it was PITA to try to load it with the poorly designed wrench/pin method it uses). Replacing the hinge entirely was much easier to achieve the correct tension, and the hex key and bar method (included) made preloading the spring mechanism an easy task.
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