http://www.curse.com/server-mods/minecraft/anvil
I've had the pleasure of using this mod on other servers and it is quite handy.
It allows for you to repair items and keep enchantments on the Item.
For example: You can repair a nearly broken Iron sword by right-clicking on the anvil (Iron block most of the times). If you have iron ingots in your inventory, then the sword will be repaired at the cost of 1 ingot per use. So 2 iron ingots will fully repair your sword and it saves the enchantment on it.
Just a small suggestion