u/Realistic_Tax_2948

Hello, is anyone here, who can help me with my omp M4 max. The complete tail assembly is free and smooth, but as soon as it starts spinning, the tailbladegrips seem to lock up. Its basicly Impossible to push the ball where the pushrod connects with one finger so i recon its basicly Impossible for the servo to move it. The more I push towards the extrempoints so full left rudder or right, the stronger the force gets. I have a slow occilation as tailwag and this is the only thing i think of, wich could cause this. Anyone know how to fix this or what causes the tailbladegrips to lock up under rotaion?