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

power it up and look at the main shaft, they seem to be the weak point on the helicopter. Make sure the flybar paddles are also aligned at 0º pitch and there equal.

I have taken the main shaft out and it doesn't look to have and bends in it. Could there be a small bend that I don't see and should I just replace it?

go to www.cprepair.com and do the century main gear upgrade. i am and it seems like it is well worth the time

If you fly your blade a lot It would be a good idea to buy some extra parts there cheap. Try replacing the main shaft

Look at the place where you take the pin out it is most likely bent a little there. Was it hard to take out?

There could be such a slight bend that you wouldnt see it and just bad enough to cause your vibration. Like the guys before me have said, remove the head assembly and rev up the motor while watching the shaft, if its bent you should see it wobble back and forth. A little wobble in the shaft transforms itself into a larger wobble on the main rotors.

it slides in and out pretty easy

Is there anyone who would recommend the century main gear conversion??