No. 6 Wrench
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The No. 6 Wrench is an item that appears in Donkey Kong Country 3: Dixie Kong's Double Trouble!. Dixie Kong and Kiddy Kong need to return it to its rightful owner in order to reach the Banana Bird Cave.
When the Kongs meet Björn in Razor Ridge, he tells them about his broken chairlift, and how he lost has his No. 6 Wrench. He can only fix his broken chairlift with the wrench. Barter has the No. 6 Wrench at his swap shop, and he is willing to trade it for the Mirror, which in turn can be bought from Bazaar for 50 Bear Coins. When the Kongs return the No. 6 Wrench to Björn, he fixes his chairlifts. He allows the Kongs to use the chairlifts, letting them reach the Banana Bird Cave of Razor Ridge.