Originally Posted by enea 54
I can not understand (sorry a problem of mine is I do not understand well English) you can show a picture of what I should check.thanks
"Shudders" can be caused by too much side to side play of the main rotors.
As indicated by the arrows
This can be caused by too large a gap in the area indicated where the main rotors are mounted onto the post on part "1".
Some users have added a washer to the post on part "1" to reduce the side to side play.