Originally posted by B4
I would suggest that yes you do use the new ackerman arm. But I would not measure the linkage as it can be different for each servo. Instead I would make sure that your servo is centered (no trim) and then change the length of the arm until the ackerman arm is pointing straight ahead.
What you say is correct. But that would sometimes require taking in and out installing it a few times. Also, Roy mentioned that he was using a Futaba 9402 servo. I think that measurement will suite it very nicely for the Futaba servo .