Push one of the shortest edges into the aileron, put a pin through the hinge so it can't be pushed further in, then repeat till the aileron's got all it's hinges in place, then push them into the wing. Then use thin CA (not medium or thick) to glue them in place, removing the pins when the CA's set. The glue will absorb into the hinge and run up into the wing/aileron. The slit in the centre is to give the glue a channel to run up to give better penetration.