I had the same problem on my 125 cp. After trying to just push it in for 20 minutes, I noticed that the ball on the new slider was way to big to fit in the socket.The fix was to carefully grind the ball on the tail pitch slider down the diameter of the ball to fit in the socket on the pitch control arm. I am sure there is a better way to do it but I wanted it fixed at the time and this did the trick.
10 flights later there is no vibration and it flies like new.
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