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I have a 5C which has a stiff power button, as in the button seems slightly too recessed and is harder to press than it should be.  it needs a new battery ideally anyway so I’ll be opening it up, my question is what needs to be replaced to have the power button clickly and easy to press like it should be?  thanks in advance for your help

Here’s the replacement guide, parts and tools links can be found there too: iPhone 5c Audio Control and Power Button Cable Replacement