E-flite Mini Ultra Stick ARF - Manual (Page 17)

It is also very important to check to be sure the propeller is
balanced before installing onto the shaft. An unbalanced
propeller may strip the gears. When installing the propeller,
please be sure not to over-tighten the 3mm locknut. The use
of the locknut will prevent the propeller from coming loose.
 2. Attach the motor to the gearbox using the screws
provided with the motor and blue threadlock.
Hint: The gearbox is in two pieces. Apply a
bead of medium CA where the two pieces join
to stiffen the mount for extreme aerobatics.
 3. Attach the firewall stick mount to the
inrunner firewall using four 4-40 x 3/8"
socket head screws.
17