Ok first one elivator i used bobs style buckle i just had to do one, you could cut the ball off as close as you can to leave a little stub to glue in the hole you drill
This is the wing stabilizer both sides i drilled a small hole for the ball to sit in (see last pic on how i got them in the right places/angle ect)below
Wing route both sides the two middel buckles have had the balls removed a five minute epoxy glue was used the two outer buckles have been seated in small holes i drilled and the ball placed in the hole
This is the front of Udets DV has a field mod an extra front buckle so if yours has one on the front place as the top one but angle down towards wing stabilizer
And finally how i got the angles right a straight bit of tin copper wire, buckle glued in place after a minute or two the glue starts to harden and i can move the buckle to the right pitch/angle as the tin copper wire, i have a few minutes to get this right
Hope that helps