I am trying to figure out what is going on with my 8911 servo. When move the throw down/up full or at any point of motion while holding that position, I can put a little pressure on the stab and it with moves up or down almost like something is stripped inside the servo. Please see video to see what I am trying to explain. Could any of you please help me identify this issue

https://www.youtube.com/watch?v=zIPrNXZnRJI