Replacing magnepan binding post


Somehow the post into which you insert the speaker wire broke off. Mag sent replacements but for the life of me I can’t figure out how to remove the back plate to get access. Would anyone know how to do this? 
novatt
I’ve owned their SMGa, MMG, MG12/qr, 1.7i models (all great for home theater) and thought I’d seen everything else Magnepan manufactured, over the past forty-some years.    All had small, round head, Phillips wood screws; holding the terminal plate in place.     What model are your Maggies?