Cleaning Linear Servo - Blade 130x & Most Others

If your linear servo is jittery around center try cleaning it before spending the money on a new one.
Dis-assemble linear servo (this one is from a Blade 130x, clean it and re-assemble.

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A crash will cause a high current pulse in the servo that deposits carbon gunk to the servo wiper resistance track. The carbon marr on the wiper track is the source of jittery servo operation. Clean the carbon build up off to restore servo smooth operation.