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Tool Binding Cast is an item added by Tinkers' Construct.
In order to craft a Tool Binding Cast, 288mB of Molten Gold or Molten Aluminum Brass is needed in a Smeltery along with any Tool Bindings crafted from a Part Builder. Place the Tool Binding on the Casting Table then pour the 288mB of Molten Gold or Molten Aluminum Brass in order to form a Tool Binding Cast around the Tool Binding.