help with 1991 lumina

i need help i broke me key off in the ignition. i got a new ignition took the the steering wheel off and i can't get the circle ring off the old ignition to get it out is there any tricks to get this off? i've tried like everything please help.

Welcome to AF. Check this link. http://autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0e/de/cd/0900823d800edecd.jsp