The drill jig helps tremendously, but it is still helpful to have a center line drawn for guidance. Make sure you oil the pin part of the hinge, wipe off the excess, and try not to get the oil on the barbs. I drip a drop or two water in each hole, and try to keep gravity working for me, by tilting whatever I'm dribbling so I can get the water down in the hole deep. Then I use one drop of poly glue for the 1/8 hinge points, and 2 drops for the 1/4. I let the glue run into the holes for 5- 10 minutes, and may help smear it in their with a toothpick. Then I take a Q-tip, and spin it in the socket where the hinge knuckle will sit. Press in hinge points, wait to dry, and do the same thing with the control surface. Works great, and I rarley see the poly glue foam out around the hinges.