{  
  "model": {
    "type": "range_dispatch",
    "property": "custom_model_data",
    "fallback": {
      "type": "model",
      "model": "minecraft:item/mace"
    },
     "entries": [
      {
          "threshold": 1,
          "model": {
              "type": "model",
              "model": "item/geweer/mjolnir"
          }
      }
  ]
}
}      
    
