If you guys really want to balance this heli, you need to take the inner shaft w/flybar, link, and upper blades attached,and balance them as a unit. I know, the flybar has a little slop in the holes, and it will take a little while to get both sides the same, but it is well worth it, and way better than balancing them seperately.That 2 gram link arm to the upper blades, at 1600 rpm will throw a wrench into the works, see?! 1 inch or so off the center of the shaft, at high rpm has got to have an effect on balance. Don't get me wrong, I got one at x-mas, and love it, they fly good out of the box, but if you go through it and "blueprint it" they are awesome.Oil all contact points (balls and arms, shafts)I oil everything except the gears, and the flybar, it's loose enough. And carefully balance all rotating assemblies as a unit, and you will have a most awesome flying machine!No binding in the shafts is a must!!! You can have slightly bent shafts without much binding, so be aware.If everything is balanced, you shouldn't have much shake at any rpm.