After everything is dry, take a piece of small sharpened brass tubing and make the holes for the adjuster screws. if you miss a little, so what. It'll be close enough. use this pic to see about where to make the hole in relation to the root rib.

The next step can be done about a thousand different ways. This is mine, it works, and it's simple.

Tack a 1/4" piece of balsa stick to the LE portion of the root just in fron of the adjuster, and a piece just behind the tube.

Apply vaseline or mold wax to the stab tube through the center and wipe it down.

Place the center piece of socket in position and slide your stabs into position. the adjuster pin should be left long and uncut at this point so everything will engage.

Slide the stabs on firmly until the pieces of 1/4" bump into the sides of the fuse. Friction SHOULD holed it all in place.

Now check the alignment for any serious problems. Using a pin and piece of rudder cable like we did on the wing, poke it in a center point on the nose and triangulate the stab. For a true reference point, use the junction where the LE meets the tip right in the corner of the sheeting. if it's off, remove everything and sand the hole in the fuse so it will turn into position. Go SLOW here.

Now reinstall and check the horizontal alignment. the easiest way to do this is to install the wing (with the incidence set), and get a chair about 8 feet behind the plane. have a seat. Close one eye and sight down the stab tips with the fuse centered in your vision. The exact tips of the stab should cross the center TEs of the wing in exactly the same place. This is one place your eyes are as good or better than a bunch of measuring. What, doesn't sound technical enough for you?

When all is well, mix up some 30 minute epoxy and glue the center socket into place with the stabs installed. (That's what the vaseline and wax are for). Keep the excess off the tube if you can. Now tweak everything until you're comfortable with the alignment, and walk away. Come back and check every 5 minutes until the epoxy cures. Tweak if necessary. Once it sets, don't touch it for at LEAST 2 hours.

When it's all well cured, sand the tubes flush, remove the 1/4" sticks and you're all set.

Now reinstall it flush and trim the adjuster pins so they only stick out about 1/2" on each side, and glue them in place firmly. Make sure you check the fit of your tube itself; sometimes it's a little too long at this point and will drive you nuts trying to get the stabs to sit flush.