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For the rooster, i would correct him any time i saw him hurt or be inappropriately rough with a hen. I would do this by immediately picking him up and holding him under my arm (very firmly) and hold his beak closed with my other hand - until he submits. If this isn't good enough for him, i would pick him by the feet the next time i saw him do it. You're letting him know that you're the boss, and you don't approve of his behavior.
For the hen - mind you i haven't had a mean hen problem personally - quite a few people utilize a hen time out. You remove her from the flock, for maybe a day, at first. Keep her some place where she can see the flock but can't interact with them - or just remove her completely. When she returns, she will have lost her place in the pecking order, and you may see some behavior changes.
There is an article, somewhere at byc, i think, that goes into depth about rooster behavior modification and establishing yourself as alpha roo. I can't seem to find it right now.
In short, for me - and this is just me - if i could not reasonably change the behavior of any chicken in my flock who was physically hurting the others - i would remove it permanently from my flock before i would spend time filing down his or her beak. Again, that's just me. Behavior like that spreads.