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|Release date||17 June 2002 (Update)|
|Quest item?||Clock Tower|
|High Alch||0 coins|
|Low Alch||0 coins|
|Store price||0 coins|
|A cog from some machinery.|
A Black cog is a quest item used in the Clock Tower quest to repair the black wheel. It can be obtained by entering the North-Eastern door at the 4 coloured tiles in the Clock tower's basement. You need to either be wearing Ice Gloves or have a bucket of water in your inventory.