hmm. try to get to really thin screw drivers or stanley knifes on each side if the pinch ring and try to get it up a bit and then use something else to get it from there.
just take a flathead screwdriver and put it close to the ring on the blackpart of the headset and hammer it like 1nce or twice easy tho its really no that hard i had the same problem
i had the same problem.
i just smashed mine on the concrete until it popped out. but thats cuz i broke my forks.
i suggest using a flathead or something.