The Mechanical Zero Tool Pro-Version is a device that allows you to set the mechanical Zero of a blade grip for setting the RC Helicopter with a true mechanical zero. It has an edge that rests on the main blade grip and another edge that rests on the yoke indicating any difference in their angles by an angled gap in between the zero finder and the yoke.
Setup your FBL to zero pitch setup and then adjust the pitch turnbuckle until the Zero Tool indicates that the blade grip is at zero degrees.
