If you want quieter operation and better rotational accuracy, the Tamiya 42367 - 950 sealed flanged ball bearings are a sensible spare part. They are built to offer steady rotation and to improve the fit compared with generic bushings.
These flanged ball bearings suit a variety of radio control components, including items like the TRF420 and TA07 MS centre pulley and the TB-05 centre shaft. They are handy as a workshop spare for routine servicing and upgrades.
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