Maybe consider a bolt or screw... the threads twist in one direction. If you lay/compare the flex shaft to the bolt/screw you will see if the flex is twisting same direction (Clockwise "CW") or the flex shaft is opposite (Counter or Anti Clockwise "CCW")
Then you would want your motor to "tighten" the "bolt"(flex shaft) and turn the prop the same direction.
Then you would want your motor to "tighten" the "bolt"(flex shaft) and turn the prop the same direction.

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