Well, when I took the rotor head apart, I check both the main shaft and the blade axle against the glass of our dinning table. The main shaft roll smoothly while the blade axle wobble. I am also considering the possibility that the wood blade I am using myabe warp. As far as if this may totally eliminate the vibration, I don't know. At this point I am just doing the process of elimination and taking in all that is recommended by those of you that give me advise. Definitely I need it.... Thank you.