Hangar 9 B25J Mitchell ARF Assembly Manual page 13

Section 1: Hinging the Flaps and Ailerons
Step 5
Slide the aileron and outer flap into position on the wing.
Make sure the inboard edge of the flap near the center of
the wing, and the outer tip of the aileron near the wing tip
do not bind against the wing. Also make sure the flap and
aileron do not bind against each other.
Step 6
Remove the T-pins from the hinge and push the aileron
tight against the wing. Flex the aileron and apply enough
thin CA to fully penetrate the hinge. Apply CA to both the
top and bottom of the hinge.
Important: Do not use accelerator when
hinging. The CA must be allowed to soak
into the hinge for the best possible bond
between the hinge and surrounding wood.
12
Step 7
After the CA has fully cured, gently pull on the wing
and aileron to make sure the hinges are secure. If not,
re-glue the hinges.
Step 8
To break in the hinges, you will need to flex the aileron up
and down a number of times.