{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    " SA",
    "SR ",
    "Z  "
  ],
  "key": {
    "A": {"tag": "forge:ingots/iron"},
    "R": {"tag": "forge:rods/iron"},
    "S": {"tag": "forge:rivets/zinc"},
    "Z": {"tag": "forge:rings/zinc"}
  },
  "result": {
    "item": "createdieselgenerators:engine_piston",
    "count": 1
  }
}