Extreme Flight YAK-54 ARF, Instruction Manual

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11.
Before installing the elevator servos, I highly recommend that you
temporarily install the servo arms and electronically center the servos.
It will be much easier to match up the servos at this point than when
they are installed. I also recommend that you thin a small amount of
epoxy with a few drops of alcohol and apply a light coat to the inside
of the stab and to the servo mounting rib as well as to the root rib and
mounting tabs. Over time exhaust residue begins to collect here and
by sealing it with epoxy you will prevent degradation of the wood.
12. Use the manufacturer supplied mounting hardware and install the
elevator servo with the output shaft toward the front of the stab.
12