The Extended brush with two canes attached is used in Creature of Fenkenstrain. It is created by attaching two garden canes to the garden brush with bronze wire. This first produces the extended brush (1). Before it can be used it must be extended with one more garden cane, which is obtainable from a nearby pile. This will produce the extended brush (3).
By using the longest extended brush with the fireplace located in the upstairs west room in Fenkenstrain's Castle, you obtain the conductor mould.