Interesting! I use Sanwa metal gear servos 'S040012C' very fast and high torque. The fit is very tight such that it only seat properly when the screw is tightened. I also use thread lock for insurance that screw won't work lose, being a metal barrel that it screws into as well.
If you extend the EPA EPO settings you can see the plastic servo horn flex to compensate for it being over driven. No sign though of the teeth slipping.
BTW - I highly recommend these servo's too!
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