The way to balance a helicopter is to hold it by the flybar with the blades parallel to the boom. Then you will see the helicopter either tilt forward, be balanced, or tilt backward. The more common one you will see is it tilting back. Then you just move the battery forward until the mainshaft is perpendicular to the flybar cage.

Are you talking about moving the flybar weights on the flybar cage? They are apart of that assembly and can't be removed that I know of. But if you had another set of weights you can have both of them right near the paddles. I have done that before.

Nick