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Limit-Stop Screws
From WikiPedalia
The limit stops are two screws that set the limits of how far the derailer can move from left to right. They are usually located on the back of the parallelogram; sometimes they face outward to the bicycle's right. The end of a screw bumps into internal parts of the parallelogram when the derailer has moved all the way in the direction controlled by that screw.
See my article on Derailer Adjustment for more details.
