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iPhone 4 Power & Sensor Cable Replacement
The power button bracket has 2 screws that need to be removed, there's no mention of them in this tutorial.
iPod Nano 6th Generation Headphone Jack Assembly Replacement
A bit of a pedantic point, but the guide calls for a PH00 Phillips screwdriver, and I found that the PH000 fit the screws better.
Also, has this site ever carried the headphone assembly? I have a feeling my power button repair won't last very long and I'll eventually have to replace the entire assembly.