Wondered what experience people had with this gyro...

Im getting some tail problems on a heli that I cant seem to correct through the gyro and mechanical geometry seems good.

Hold in heading hold and slowly rotates in normal mode (which is my preferred mode).

I can use the tail trim to correct buts it never spot on for different speeds and the auto trim adjust feature of the gyro is not correcting the problem.

Any ideas?

Ive used the CSM 400 in the past and for what it is it works fine... never had any trouble really... apparently not the same withe the 420... unless its something else, but like I say the geometry on the tail linkage is sound.