Make sure the flybar is centered on the head. Should be same distance from wheel collars to paddles. (about 2 and 3/4 inches) With the blades removed, disconnect the flybar links and the ball links to the seesaw or blade grip. This will let the flybar balance inside the seesaw. If it is tight, try loosening the screws on the sides of the seesaw (not too much). If one side is heavier than the other, loosen the wheel collars and slide the flybar to the lighter side until it balances. Reattach all the links. Now, balance the blades so they are the same weight. I usually add a piece of black electrical tape to the leading edge towards the tip of one blade to help in tracking. Then, I add the tape at the center of the blade for balance.

I use a 6 inch ruler as a mount and create a fulcrum.

Some guys take the whole head and shaft off the heli and balance it on a prop balancer.