Hello...... I see you are just north of me. I am on the east side if Indy. I built my Fly Baby this past winter and I remember the step you are refering to but don't remember exactly how I did it. If my old memory serves me a little.... I made some small wedges to force the bottom spar UP into position for glueing. Cut 2 small wedges and come in from the front with one, and the back with the other. Balance the pressure so the spar doesn't "twist". I for the life of me can't remember how I held the rest of the wing down, againest the up-force of the wedges. (Weights I guess). I wish my membory was better.[] I installed some hard points in the tail feathersfor flying wires, and also for control surface horns all over. Note in photo ... aileron is not like the plans. I read another guy's build and he suggested this way. The plans type seemed to twist. (he said....). I have a supply of pictures while building and some text too. I was going to write an article on the build. I did not finish it but some info may be helpful. Let me know if you are interested. ....lownslo..