Which is used in conjunction with a pitch gauge, such as this one available
from Miniature Aircraft USA.
With the collective stick at half, verify that the pitch on the blades is at 0
degrees. If not, go back and find which bellcrank is NOT exactly level,
horizontal, or vertical. You should also be able to a- 12 degrees of
pitch at top and bottom stick. This may require increasing the pitch ATV or
travel adjust in the radio.