WING Servo
I have assembled a Superstar 40 and assume the basic assembl isn't much different than the 60 size plane. The wing servo installation is confusing if you merely try to follow the written instructions. But a little common sense will make the instructions un needed. Also, my wing halves are permanently joined (not the metal rod/temporary arrangement).
Unless you have some precision wood working tools, preparing the correct angle of the the servo tray mounting blocks is tricky to do all by hand but possible. I got an extra piece of wood stock (not balsa but harder stuff) and shaped them a couple of times until I made 2 that had a decent fit. It's critical that the angles of those blocks matches the dihedral of the wing. Test fit them on the wing to make sure both lay flat with no gaps or rocking. This will make a strong bond when you glue it to the wing.
There is an opening precut in the wing halves but I had to enlarge it slightly to allow the body of my Futaba servo to fit down enough in the opening. If this is your case, carefully shave away more wood from the already notched wing ribs. Remove just enough until the servo will fit into the hole. Make sure there enough clearance for the servo to go in. The servo wire and connector plug has to be held back outside the hole.
Using slow cure epoxy for all of this, glue the flat side of those beveled mounting blocks to each end of the flat piece your servo will be mounted to. Test fit the servo into the opening of the flat piece to assure it is large enough. If not, shave away at the opening. Allow at least overnight cure.
Next put the servo on the mount and mark where the 4 mounting screws will be located. Predrill holes into the wood (holes smaller than the screws). The screws should also screw into the beveled mounting blocks. Mount the servo. Place the assembly into the cutout in the wing. If there is Monocote covering anywhere the mounting blocks contact the wing use a marker and trace around the whole assembly. With an exacto carefully cut and remove the Monocote being careful not to cut into the balsa sheeting on the wing so you have a wood-to-wood contact. NEVER GLUE WOOD TO MONOCOTE. The joint won't hold.
Test fit the assembly. The angled mounting blocks will create about a 3/16" standoff of the flat servo mounting piece allowing plenty of room on the sides for that servo wire. Apply epoxy to all wood-to wood surfaces. Clamp or tape down and allow to cure.
Good Luck...Jim