Made a hole through rib N4 to allow landing gear retract spring to pass through. Despite using the LH wing and rib as a template, the hole for the spring in the RH wing was located slightly differently. The hole needed to be enlarged significantly. I'll do some work to close up the excess opening.
Additionally, since N4 was now glued in and secure, I was able to properly locate the fitment of the diagonal subspar. I cut a notch inN4 where the subspar will pass through and glued the subspar frame together.