ORIGINAL: Missileman
Nitro Models/CMP does have very limited instructions.
I suggest you look around at other Extra models of the same size that have downloadable instructions and see where they measure.
There is a downloadable manual of the Great Planes Extra 300S with a 64" WS, should be about the same, on this page:
http://www3.towerhobbies.com/cgi-bin...&I=LXJ580&P=ML
The throw indicated in the manual of the Great Planes Extra 300S is 5/8" for high rate.
Since the width of the aileron is 2", the angle is about 9 degrees.
The referenced 1" throw for your Nitro Models Extra should be measured at the wider portion of the aileron, i.e. 3".
Then the angle of deflection will be 18 degrees.
If measured at the 1" width, the angle would be 45 degrees, which seems too much.
Regards!