This might help, there are 3 screws on the back part of the center mounts loosen them off then make sure the middle spur gear is nice and free and runs smooth then tighten them up. I have found that if you build it with out it being all together then can be a little off. Also make sure that the center drive shafts are free no binding this also makes that bit wobble in the middle. Let us know how you get on.
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