Conductor mould is an item used only in the Creature of Fenkenstrainquest. It is obtained by cleaning the fireplace that is located in the west room upstairs in Fenkenstrain's Castle with a garden brush. By using a silver bar with a furnace when holding a conductor mould, it is possible to make Conductors (requires level 20 Crafting). After the quest, it is still possible to smelt Lightning rods; however, the mould can no longer be acquired if lost.