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Have you visited Aristo's Forum. I'm sure they (Aristo) and other members would be interested in what you found. I was there this morning and saw what some have done to "quite" their gear box noise....add grease. <br /> <br />I can relate to your pain. I recently got a set of USA PA/PB and have found defects with the sliders on those engines causing them to run poorly. While the engines still work, it's a pretty rough ride for those onboard. I'm hoping to get replacement ones this week.
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