Help on Servo Glitch

[iforgot]

Hi newbie here
I need help/advice on my feda draqonfly hs 55 servo. The elevator servo seems to be glitching whenever I move the elevator stick slightly upwards. The Tx and heli baterries are charged. I swapped the aileron and elevator channel but the elevatro servo i still glitching meaning theres no problem with the rx? Have anyone experienced this before? A few days ago I tilted the heli was hovering a few cm off the ground and the main rotor hit the ground (the force was not very hard butit folded the main rotor a bit). But after that the servo was still ok until today, I was wonder wheather the crashed could have damaged the servo.
Any advice? Thanks

by the way the servo seems to glitch if I slowly push on the elevator servo with my fingers. (Please see attahced movie clip)
Glitch video clip

[MicroHeli-Nut]

It's definitely your servo finding center... and i suspect stripped gear train cause your servo arm is moving.......

[iforgot]

Problem solved

I finaly solved the glitching problem. I openned up the servo and saw that the shaft connected to the thing (I dont know what they're called) that is connected to the 3 servo wires are a bit slanted. The impact when the main blades hit the ground could have missaligned the shaft and gear. I realigned the shaft and the servo is now working properly. Saved some $
Thanks to james and ray for the advice