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tfw i knew that these complex derailer systems would not last me long. its already so fucked that the chain is constantly hitting the chain guard or whatever that piece of metal near the chainring is and its so loose that the lowest gears wont work at all. should just take it to a bike shop but that will probably be expensive but they have the special tools that are required for service of bikes and i have only standard tools that will only break sensitive things like bikes.