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Hi, just bought a zoom 400 off ebay, overall pleased, it has metal head tail rotor etc, so looks good, however the tail cog? just turns round on its own can't see how it's supposed to be secured to the shaft. It doesn't look broken but must be somehow. Didn't get any plans with it, and don't know where the upgrades came from. Any advice on what i can replace it with, or where i can get the standard parts from? Any help would be very appreciated, thanks.