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The bushings are inside the magnetic core which fits inside the rotor, a 2mm OD x 1 mm ID ball bearing might be a bit hard to come by, but even if you could find one the benefits in this size and type of coreless motor would likely be marginal at best.
The shaft, magnet, and coils act like a magnetic bearing with the shaft actually floating inside the central magnetic core and wound rotor’s magnetic fields. As long as the bushings are centered correctly, the shaft is straight, and the pinion to spur gear mesh does not force the shaft against the bushings there is almost no contact between the shaft and bushings when the motor is running.
Could possibly be done by making a new magnetic core and sacrificing a bit of magnet for ball bearings, but centering the new core and lining it up would be brutal not to mention the weaker magnet.
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