This step is not necessary for the Corona since it is already performed by the instructions in the construction manual. The tilt of the flybar paddles needs to match the tilt of the swashplate. This is done by adjusting one flybar paddle at a time.
First, make sure the flybar paddles are parallel to each other. This can be done using the KSJ-624 paddle gauge or just by visual inspection. If the paddles are not parallel to each other then loosen the paddle mounting screw or setscrew and twist the paddle and retighten the screw.
If you use the KSJ-624 paddle gauge on a micro heli, the weight of the paddle gauge will twist the paddle and change the pitch by a few degrees. To avoid this, hold the heli so the flybar is perpendicular to the ground and then sight along the edge of the paddle gauge down to the ground. This will prevent the weight of the gauge from twisting the paddle.
Next, rotate the main rotor so the main rotor blades are aligned with the body, e.g. one points forward and the other points backwards.
Pick one flybar paddle, and lower it slightly so it almost obscures the swashplate. Now align the outer edge of the flybar paddle with the top of the swashplate. It should be level with the top of the swashplate. If the paddle is tilted relative to the swashplate, then this should be fixed by shortening or lengthening the linkages between the swashplate and the flybar paddles
Now rotate the rotor head 90 degrees so the flybar paddles are aligned with the body. Check the same paddle against the top of the swashplate again. It should still be aligned.
Repeat the last two steps for the other flybar paddle and make sure it is aligned with the top of the swashplate at two different angles 90 degrees apart.