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Old 04-07-18, 05:50 AM
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It sounds like you are having a problem with your shifter not staying in place, not with the derailleur. Most of them have an adjustment screw which needs to be tightened to hold the shifter setting. This screw often needs a lot of force to tighten it sufficiently. Many friction shifters have small plastic parts inside, one of which may be defective.
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