what you need to do firstly is find which wing halve is out with the tailplane incidence, tailplane should be 0 degrees as so the main wing. to get the wing halve thats out of degrees correct you need to elonggate the front and rear guide pin holes in the fuselage side so you get the degrees you want. when your happy with this you then need to epoxy a sleeve into the oval shaped hole in fuse so both front and rear pin holes are back to the round shape so when you fit the wing halve all is spot on every time.