alvin1,

Thankyou for the reply. I did not see how the measurement could be off due to each blade grip being bolted on until it bottomed out. I suppose that if the spacers were not the same size, or if the blade grips were not exact how this could be a problem. Mine however are exactly 70.5mm from the center of the head to the center of the blade grip mounting screw. I have not been able to fly since I last raised the headspeed, but I will raise it some more next time out and let you know if it helps. I only wish I had a way to measure headspeed. without spending alot of $ for a heli tach.