| is very few things one can do and all are easy to... not knowing or being there is hard .... but im guessing it a ten speed or like it... they are screws on the front sprocket look see where it move when you change gears keep the chain straight or some jumping off track a simple turn should do it one way or the other... the rear sprock is the same way it works it also as screw to adjust the movements one screw for the top stop and one for the bottom stop keep the chain in line a pocket screwdriver is what you will need
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