Aww, poor thing! We do mini-operations like that at work, there's a regular quaker that comes in once a month with a deformed bottom beak which will curve in and grow into it's cheek if we don't maintain it. It's really tricky, but interesting and fun to do. I'm glad you were able to help him out! And I'm glad to hear it's not beak and feather, the poor dear. Good for you for giving him a loving home and nursing him back to health!