Blade CX Balance problem

Been flying for few months and occasionally need to replace a rotor blade
<G>. With the yellow training balls, things don't get to far out of hand
yet.

After last crash and new blade, a vibration occurs upon liftoff at about 12"
off the ground as speed revs up and quickly becomes a violent shake. I
immediately shut down.

In previous repairs, I had straighten the flybar to eliminate vibration.
This time the flybar appears perfect..

Don't know if it is pertinent or not, but in past I noticed that sometimes
switching the flybar linkage to the other side of the upper rotor blades
smoothed things out.

This rookie would appreciate any help.
Thanks, ***


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