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He's right! The lower shaft HAS to be in perfect alignment with the coupler on the opposite end of the bearing. There is a small cup that the lower shaft slides into on the inside of the rear-end. When the track is tacky, you are "wobbling" the bearing around, no pun intended. But, on a tacky track you are still getting good bite. When it gets slicker, that alignment is crutial to the handling of the car. Even that slight little bit of bind internally will make the car unpredictable. Also, don't use Chineese bearings. They are cheap and unfilling, just like their food. Use, NTK, Fafnir, or my personal favorite, ***.
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