Your pictures skipped a lot of production. I jammed the Dowel in the spar last night as well. In my wings, the servo wire hole was not cut out. I took a small piece of piano wire and heated it with a torch and just jammed it all the way towards the servo holes. It made a perfectly round quarter inch hole. However, there is a piece of balsa ply between each servo bay in the wing. I hit that and everything screeched to a halt. Had to pull out the drill to get through it. I'll take some pics of that tonight.