Kodokuna correcting my previous comment; Both bearings are made of bronze (none of the plastic).And in your favor I have to say that the 360º conversion of the servo is very easy to remove a single piece of plastic, a cap of the crown output and the corresponding resistances

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BG131719212 If you look closely, the plastic gear is the one that moves the potentiometer, which is how analog servos work, so if there is no external force, it does not have to be metal.

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