Model Tech SE5a SCOUT Instructions For Final Assembly page 9

STEP 2: ALIGNING THE VERTICAL STABILIZER
Remove the rudder and three hinges from the vertical stabilizer and set them aside for now, then remove the elevator
and four hinges from the horizontal stabilizer and set them aside for now, too.
STEP 3: MOUNTING THE VERTICAL STABILIZER
Using a modeling knife, cut away and remove the covering
material from over the bottom of the precut slot in the middle of
the horizontal stabilizer.
Push the vertical stabilizer into the mounting slot in the top
of the horizontal stabilizer. To align the vertical stabilizer
properly, the trailing edge of the vertical stabilizer should be
even with the trailing edge of the horizontal stabilizer and the
vertical stabilizer should be pushed down firmly.
Using a builder's triangle, check to make sure that the
vertical stabilizer is aligned 90º to the horizontal stabilizer.
While holding the vertical stabilizer firmly in place, use a
pencil to draw a line on each side of the vertical stabilizer where
it meets the top of the triangle stock on the horizontal stabilizer.
Remove the vertical stabilizer and use a modeling knife to
carefully cut away and remove the covering material from
below the lines you drew.
WARNING When cutting through the covering to remove
it, cut with only enough pressure to cut through only the
covering itself. Cutting down into the balsa structure could
weaken the stabilizer and cause it to fail during flight.
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