Digital Crown Flex removal

Hi there,

I am working on replacing all the ANC mics on my APM due to hiss. I got the left fixed, but hit a snag with the right. This mic flex also includes the button for the crown, and I cannot see how on earth I get that off the old one. You can see in my picture that the screw has zero room to get to it, same on the bottom. Does anyone know how that is meant to come off, or how I detach the crown to get to it? Is there a special tool I need? Thanks!