Spinwing
Not sure what you are trying to sell, but tail rotor track and balance has nothing to do with the current issue on the 139. Currently the tail rotor blade is the focus of the investigation. The balance and pitch variations used even to the extreme of gross incompetence may have a long term impact on secondary airframe structure, but are just a flea speck on the loads seen on a hub or blade (they rotate so these adjustments are just very minor static load variations).
The Sultan