Grimrock

I go with an Armor / Mace Minotauren Warrior and Unarmed / Athletics Minotauren on front and an Ice magic / Spellcraft Insectoid Mage with an Throwing / Assa / Dagger Human Rogue on the back. Fights are quite easy. The unarmed fighter kicked the least amount of ass throughout the game, by far. Woah,...

Can somebody tell me where to find the Bladed Cog? Searched on both Floors but can't find it.