notice the pitch change horn and push-pull tube is on the trailing side of the grips -- just like our hbk2!...also notice that the main rotor blade has trim tabs on the outboard and inboard trailing edge...those are bent up or down with a simple tool to fine-tune the tracking...when the shrink wrap on our hbk2 wood blades start coming apart, it affects the airfoil - like trim tabs, and the blade would want to fly up or down...ken