Probably the most common complaints ( at least since the migration to Lithium batteries ) is that the tail motor can only perform well for several flights; this is caused by the higher capacity Lithium packs wearing out the brushes on the inexpensive tail motor. This Flight  Tech upgrades does the trick, it reduces the load of the individual motor by splitting its work load to a 2nd motor. The additional tail weight is insignificant but now the tail motor(s) will outlast most  other components of the Helicopter as the brushes can handle the voltage with ease.

This upgrade also comes with a metal tail guard to protect your tail blade; the metal wire guard is inserted into the CNC tail hub base so it will not break or crack the boom.
Also, the complete tail hub assembly is connected to the boom using (2) large set screws so you no longer need to glue (CA) the tail hub; this feature makes it real conviniant to replace damaged booms.
As for the electronic configuration, you simply split the + and - wires at the end of the boom ( were the come out ) and feed one + and one - to each one of the motors to split the work load, it is very simple.