mc_rebalance_datapack/data/tetra/modules/double/basic_axe.json

{
    "variants": [
        {
            "materials": [ "tetra:wood/", "tetra:stone/", "tetra:metal/", "tetra:gem/" ],
            "key": "basic_axe/",
            "extract": {
                "availableTextures": [ "crude", "metal", "shiny", "tconstruct" ],
                "models": [ { "location": "tetra:item/module/double/head/basic_axe/" } ]
            }
        }
    ]
}