Who knows exactly when or what caused the damage to your box for absolute certainty. But it's fair to say that the previous owner was no help. Remember that the bushings MUST provide a secure and stable platform for your gear train or the whole thing is doomed to fail. Your mechbox may "look good" but may not be worth a hoot. Just try different bushings if you have some available, and if not get yourself another mechbox. I have at least 4 or 5 Marui and G&G mechboxes that this happens to and I won't use them again. It's not uncommon for this to occur, but some guys will disregard it and use them anyway. Just think of bushings from a mechbox exactly the same as any bushing or bearing in any other application, like the transmission in your car. They must be secure in the mechbox to do their job so that the gears and everything else can do their job.
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