W202 1997 C230 - How To Unhook Low Beam Clamping Ring?

I feel like an idiot. Can someone help me out?

I got the cover off and removed the electrical connector, but I can't figure out how to unhook the clamping ring that holds the bulb in the cutouts of the bulb socket. How do I get that bloody clamp off???

__________________
Michael

1988 300 SL (5 Speed)
1994 E320 Wagon
1997 C230