Great Planes Extra 300SP Performance Series ARF - GPMA1022 - Manual (Page 12)

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3. Once the trailing edge of the stabilizer has been centered,
insert a T-pin in both sides of the trailing edge as shown.
This will hold the trailing edge in place while it is aligned with
the fuselage.
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4. A mark has been provided in the center of the front
former. Insert a T-pin on this mark, attach a string or a tape
measure, and adjust the horizontal stabilizer by rotating
it until the distance to either side matches. Once you are
satisfi ed that the horizontal is aligned correctly, as shown,
place a T-pin in the leading edge of the stabilizer to mark
where it intersects the fuselage.
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5. Remove the T-pins and the stabilizer. Using a straight
edge, connect the marks you made with the T-pins. If there is
covering in between the marks and the already cut portion of
the covering, remove that section of the covering. Be careful
not to cut into the wood when removing the covering.
Use a soldering iron to cut the covering. The tip of the
soldering iron doesn’t have to be sharp, but a fine-tip does
work best. Allow the iron to heat fully. Use a straightedge
to guide the soldering iron at a rate that will just melt
the covering and not burn into the wood. The hotter the
soldering iron, the faster it must travel to melt a fine cut.
Peel off the covering.
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6. For this step, make sure you have plenty of alcohol
and paper towels handy. Reinsert the T-pins in one side of
the horizontal stabilizer. Mix up a generous portion of 30
minute epoxy. Apply the epoxy to the top and bottom of the
stabilizer in the section that the covering has been cut away
from. Insert the stabilizer into the fuselage, mating it with the
T-pins. Wipe away any epoxy that appears around the joint
using alcohol-soaked paper towels.