Slot the tailplane through the slot in the tailplane. Make sure that it is exactly centered. Set the fin at the
edge of a board and use a right angle to get the fin at 90 degrees to the tailplane. Glue in place with
superglue.
Position the tailplane and fin on the rear of the fuselage. The top edge of the tailplane will align with the
top edge of the fuselage and the rear of the fin will fit to the rear edge of the fuselage.
You can use small spring clamps to hold the tail fin in position. When you are satisfied with the fit, glue
the assembly onto the fuselage. Make sure that the fin is vertical and exactly in line with the fuselage
center line.