My blade mcx is suffering vibrations of the tail.

What is an easy way to check and correct blade balance?

I have also seen references in this forum to bent inner shafts. How ban I determine if I have this problem?

Thanks for the help

If the tail is jerking and quivering, it is because the gain is too high on the 3-in-one or 4-in-one module.

Symptoms for blade balance is the mast head vibrates a lot.

The MCX has a 5 in 1 and there is no adjustment for the gain (yaw gyro). The tail vibrates at a very high frequency and changes depending on rotor speed.
I believe that my problem is slightly out of balance blades.

Thanks