i have already rebuit my rotor head once. whats the complaint about the grips? i'm learning to fly in my garage and icame down next to a foot stool i must have cut the throttle back, when i hit it , it looked exspensive , the blades flew all about the heli rested on its side. iwent to look at it and could not believe what i found NO DAMAGE. i had to flip a rotor blade 180 degrees so the leading edge of the blade is facing in the right direction i couldn't find anything wrong , it figures... ihit my arm with aspining rotor blade , not hard and i had to rebuild the rotor head..