Don't attempt to rework the ring. Usually the metal used is cast or wrought and is brittle. If you try to "move" metal, you will end up removing it. If you have the old ring, try this: spread the ends of the ring apart. It won't take much for that ring to snap. It will not bend. If you want to find out if the end gap is too much, contact Frank Bowman (renown aftermarket ring manufacturer) and ask him.