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it could have happened for many reasons. if it was outside, the piston/gears could have become cold and thus brittle. Etc etc. Just replace the gears with known brands such as Prometheus, Guarder, Systema, or Modify (i have heard a lot of good from them despite the fact that they are new to the market). and get a new piston. I recommend Prometheus, Guarder and again Modify. I haven't heard much good from Systema pistons.
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