Spinroll:
I went to the hobby shop yesterday to nab some junk for my truck, Had the guy open a Blade for me so i could check out the see-saw on a brand new one. Exactly the same.
The cool thing about these little heli's Vs the gas ones.. ya can hold it in your hand and scope out its performance. As I was doing so, I watched how the entire rotor head reacted as I manipulated the body. From what I can tell, that rubber o ring slop sort of acts as a buffer between the main blades and the main shaft, If you hold the main blades at their tips. wiggle it around some and I notice that the weight of the body is much smaller than just pushing up and down on the blades. I have concluded that its not the o ring slop thats making your blade tracking difficult.