I have a chandelier with 6 lights . The globe covers are open facing down and after I remove the bulb , I see a thin round matal piece that has a small tab on each side. I was able to remove 1 metal circle by pinching the 2 tabs but I couldn't budge the globe. So I tried another light and couldn't even budge the 2 tabs. It seems impossible to remove the globes. Any ideas?