E-flite Mini Funtana 3D EP ARF - Manual (Page 38)

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Note : It is very important that you check to be
sure the propeller is balanced before installing
onto the shaft. An unbalanced propeller may
strip the gear. When installing the propeller,
please do not over tighten the 3mm lock nut.
The use of the lock nut will prevent the propeller
from coming loose.
 2. Attach the propeller using the supplied 3mm
washer and 3mm lock nut. Make sure not to
over-tighten the 3mm lock nut.
 3. Press the spinner into position on the
gearbox shaft.