I have been flying the Blade CP and had a hard landing the other day. Ever since the helicopter vibrates like crazy especially with the blades on but even without the blades there is a slight vibration. I have read many posts and inspected the main shaft but it seems fine. Without the entire head assembly on and running the motor there is no vibration. Besides balancing, blades, spindle, flybar, and the main shaft what else should I check? If there is a post with this answer LMK