{
    "replace": true,
    "slots": [ "double/head_left" ],
    "keySuffixes": [ "_left" ],
    "materialSlotCount": 0,
    "rarity": "temporary",
    "displayType": "improvement",
    "glyph": {
        "textureX": 128,
        "textureY": 240
    },
    "requirement": {
        "type": "tetra:and",
        "requirements": [
            {
                "type": "tetra:locked",
                "key": "tetra:utilize/hammer"
            },
            {
                "type": "tetra:module",
                "module": "double/basic_hammer_left"
            }
        ]
    },
    "outcomes": [
        {
            "requiredTools": {
                "hammer_dig": "minecraft:iron"
            },
            "improvements": {
                "double/utilized": 0
            }
        }
    ]
}