It's been a while since I have built a 4* but I think once you have the wing lined up where you want it, you drill thru the wing and the hardwood blocks in the fuselage with a tap drill for a 10-32 thread. After you have done this you remove the wing and tap the hardwood block 10-32. Then open up the wing holes to accept the wing bolts. You should also harden the threaded holes with thin CA after you tap them. I hope this helps.