My CX2 shakes really bad. I replaced the inner and outer shafts and the balence pole, but nothing changed. Any suggestions?? Thanks.

Make sure blades are balanced with the little etched numbers by the grips matching. Also check upper blade tracking,should tell how in your manual. If all that checks out look for missing gear teeth,check bearings,and make sure you have not broken lower hub blade pins. That should be a good start! HTH