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Our team found that the problem with the Fisher-Price gearbox is not so much that the gears are bad, but that one of them is seated poorly. If you open up the gearbox, the shaft for one of the gears is sitting (on one end) in a miniscule little ring of plastic. The shaft had broken part of the plastic ring and slipped out, causing the gear to mesh improperly and strip teeth. Once we drilled right through the gearbox to secure the shaft more solidly, the gearbox worked much better.
Ian Mackenzie
Team 188
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