Hi, the attached photo shows what I believe is a vinyl siding mounting block with the "cover" in place. I've tried pulling with my finger on the cente hole & using a putty knife around the edges to pry the cover away from the bezel. Neither cover wants to budge. How do I remove them? Is there a special tool? -- if so, what's it called? Maybe they're not supposed to ever be removed?(!). I intend to mount speakers here. I don't feel I can trust the "flimsiness" nor the hollow behind the cover it for holding the speaker's weight. __And I'd like to clean the old bees nests out of them. Anybody care to venture a answer or suggestion? thanks folks.