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depending on if you are close to a gun doc, I would suggest finding out if you are and having them look at it for you.
If you aren't, then it might make more sense to buy yourself a whole new gearbox from ebaybanned or ehobbyasia, because when you factor in shipping to and from a gun doc and his fees and cost of replacement parts as well, it might cost you more to fix it than to get yourself a new gearbox, which is like $70 shipped.
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