Can spark hammers be repaired? Or do you just have to replace when durability is gone?

I believe the tools can be repaired. I see it in my code, but I haven't tested it for a while. Every tool, if possible (and excluding Mjolnir) should be repairable. The special hammers should have the following repair materials:

• Mini Hammer -> Iron Ingot
• Giant Hammer -> Iron Block
• Powered Hammer -> Iron Block
• Nether Star Hammer -> Nether Star

All other hammers which are repairable should be able to be repaired using the material that's used to make them.

If this is broken please let me know!