with the small amount of filling needed dont trip on micro baloons just make sure the rod is covered in epoxy looks like your channel needs to be a little longer not any wider. cut it to the edge of the aileron hinge side so you secure the rod fully if you don't bury the rod in epoxy you might get some loosening again after your repair. as noted in my post I only flew my plane a few times before the aileron started flapping I think its just ARF sloppiness I think mine wasn't glued in either