The video helped me fix the problem with the power button: https://www.youtube.com/watch?v=rLpmEPqE668
I did not need pliers to insert it.
If you need pliers I wonder if the strip is too thick?
In my case the strip slid in easily above the power button but not above the volume buttons or the camera button, but they still seem to work more or less normally.
The power botton was the one that did not work anymore.