Minecraft/Forge 1.7.2 Crafting Item Durability

//Declarations:
public static final int WILDCARD_VALUE = Short.MAX_VALUE;

//Main class, in the preinit:
ItemStack transientCharmEnchanted = new ItemStack(transientCharm);
transientCharmEnchanted.addEnchantment(Enchantment.knockback, 2);
GameRegistry.addRecipe(transientCharmEnchanted, new Object[]
{
    "BBB",
        "BBB",
        "CAC",
        'A', new ItemStack(Main.runicChisel, 1, WILDCARD_VALUE),
    'B', Main.transientMetal,
    'C', Main.iridiumIngot,
});

//Item class:
public class ItemrunicChisel extends Item
{
    public ItemrunicChisel()
    {
        super();
        setCreativeTab(Main.imtab);
        maxStackSize = 1;
        setMaxDamage(7);
    }

    @Override
    public boolean doesContainerItemLeaveCraftingGrid(ItemStack itemstack)
    {
        return false;
    }

    @Override
    public ItemStack getContainerItem(ItemStack itemStack)
        {
            ItemStack cStack = itemStack.copy();
           cStack.setItemDamage(cStack.getItemDamage() + 1);
            cStack.stackSize = 1;
            return cStack;
    }
}