Better Anvils Mod 1.7.10 is a small mod that just removed the anvil XP limit. It does not work on servers without the mod installed, even though it appears to, and it also appears to remove your XP, but you have it back when you re log!
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How to install Better Anvils Mod 1.7.10
Better Anvils Mod 1.7.10 Download Links:
Other Versions:
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For Minecraft 1.5.1
For Minecraft 1.4.7
For Minecraft 1.5.2
For 1.6.4/1.6.2
For Minecraft 1.7.10