Quoted from goldant:After having spent so long trying to unscrew it I was really surprised to see it pop out after two gentle knocks from the nut driver.
Just in case anyone is curious, I used the back of a nut driver to rest on the screw (since it is far down there and buried under cables), and hit it with another nut driver to pop it out.
Thanks ltg it totally worked!
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Same situation with mine.
Driver on driver isn't working though....
My newton ball had rust pits on it, hence me wanting to replace it.