I was having serios troubles with one of thise moduls,it started to make sounds(trak trak trak).After i opened it i saw that one of the gears was in bad condition i replaced it and for nearly a month the machines was working fine,now the same problem this time the gear was totaly crashed,the bushing on the shneck too.When i return the developer and manualy spin it its having pressure,does someone know what cause it?Sorry for my bad english, still improving it 

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