This is probably the hardest step. It's not technically difficult, but cutting holes in you brand new center panel can give you a bit of the hand shakes.
As with any task a little prep before can make the task much easier. Going back to the tools that I listed out in the earlier posts you'll want to have that diamond tipped cutting bit and a conical stone sanding bit along with your Dremel. You'll also need scissors, a felt-tip pen, a hobby knife, some scrap balsa sheeting, the top of a servo case (clear plastic will work), and one of your clevises.

Cut the top off a case containing a servo. Most servo cases are clear so this generally is a good place to go to get a piece of plastic. Get a ruler and measure 2cm from the edge of the plastic. Place a dot there. Now take the ruler away and place your clevis so that its tip is on the dot. If the other end goes off the plastic that's ok. Make sure the clevis is sitting so that the pin would be parallel to the surface of the plastic, basically in the same position it would be as it was exiting the wing. You'll now take the felt-tip pen and draw a line around the clevis. The outer edge of the line should extend at least 2m, the width of the tip of the pen, from the clevis. Next remove the clevis and color in that whole area.
You can now position this on your upper wing skin to see how the hole will look in the skin. Don't be too concerned. You haven't cut anything yet.
Now time to cut! The plastic! Cut out the
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