Hi, the servo part number includes the range of travel for the servo, e.g. a T3-12A has 1.2" travel. Get a 9V battery and touch the two power wires until the servo is fully retracted, then reverse the wires and drive out till you're at half-stroke (which for the servo above would be 0.6" or 15mm. If you want to get really creative you can wire in the indicator light temporarily and just drive it until the middle light only is illuminated.
Thank you a ton. I will give that a try, sounds easy enough the way you explained it.
You wont necessarily want the rod sized for neutral with the servo at its mid point since you want about twice as much nose up travel of the tab as you have for nose down travel.
I see, so how would I do it properly in order to take that in to account?
One way would be to measure how much travel your particular servo has between fully retracted and fully extended (or use the model # of the servo... the 12 is 1.2 inches of travel).
Then adjust the servo so that it is retracted 1/3 of the total from what it is when fully extended.
Make a push/pull rod of proper length with the tab in its neutral position.
That should get you pretty close to meeting the minimum deflections specified in the manual and a properly made rod will have enough adjustment range to tweak it as needed.
Does that sound about right?