Wow. This is more help that I'd ever have expected. Would it be too much if I just shipped one of you all the parts and you returned it covered and ready to fly?
I didn't want to sink the torque rod deeper into the aileron to close the gap because then the front of the aileron would sweep the hinge line and that doesn't seem good building practice.
But what I will do, is do it right, and build up the TE of the wing to close up the gap. This way I will be less inclined to do the same thing next time.

Luckily, I don't need to build up the front of the aileron as the piece was slightly oversized anyway.
Many, many thanks!
Now off to cut wood!