Ok, its not a bad little gyro...certainly good enough for learning with and some forward flight with tight turns and hacking about....the only limit I found was in doing forward flight and then doing piros (tail spinning about) the gyro seemed to hold the tail a bit too tight...the tail would come around eventually.
To set the gyro;
set up the correct sense...ie it moves the correct way to correct yaw.
when hovering if the tail keeps drifting left or right...dont use the radio trim...keep it centered....land and go to idle...BE CAREFUL!...might be better to switch the engine off.
using the connecting rod to the tail pitch lever....unclip and adjust the linkage in or out to suit....go hover again....if the tail stays straight then you are ok...but any drifting...land and adjust again.
For a reference, the tail rotor will have about 5 degrees or so of pitch in its nuetral postion...ie the servo arm is 90 degrees to its servo body...with rotors running the heli will have torque...the 5 degrees or so of nuetral pitch will counter this.
Be careful of setting up the linkage for the tail rotor...any 'binding' could easily pop a linkage...which will give an interesting episode....better not to try this
Rob