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Servo arms?

Sadly it is not as simple as suggesting an alternative servo arm without knowing more about the servo. It is unlikely that FT actually manufacture their own servos, more likely that they will be re-badged versions from another manufacturer.
The issue is not solely the diameter of the output shaft, but also the spline count, with this info, an alternative could be suggested.
A search for FT 9g servos has suggested that the model number is es08aii, which corresponds to the EMax 9g servo of the same identification but sadly no specific information for any potential alternative arms.
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