GREAT PLANES Yak 54 36 ARF Instruction Manual page 11

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3. The elevator halves should be positioned behind the
horizontal stabilizer so that there is a 1/16" [1.6mm] gap
between the ends of the stab and elevators. We cut a piece
of scrap wood 1" [25mm] long and put it between the
elevator halves as shown to properly space them apart.
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4. Center the elevator joiner wire over the elevator halves
and mark its location near the LE of each elevator.
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5. Using a #54 or 5/64" [2mm] bit, drill 7/8" [22mm] deep
holes at the marks you made through the LE of the
elevators. Use a hobby knife to trim away a bit of the beveled
LE inside these marks. Test fit the elevator joiner into the
elevator halves.
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6. Lay the elevators on your work surface and confirm that
they both lay flat. If not, "tweak" or bend the elevator joiner
wire slightly until they do. Do not glue the joiner wire in
place at this time.
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7. Carefully cut a slot for the elevator control horn on the
underside of the left elevator half. The slot should be 1/2"
[13mm] from the inside edge and 3/8" [9.5mm] long. Test fit
the control horn into the slot, being sure that the control horn
holes are positioned over the hinge line.
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8. Trim the covering from the tail of the fuselage for the
horizontal stabilizer. Insert the elevator joiner wire into the
back of the stab slot.
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9. Position the horizontal stabilizer into the stab saddle,
centering it left and right and making it square to the wings.
Mark the outline where the stab meets the fuse as you did
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