GREAT PLANES Waco YMF-5 Instruction Manual page 8

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9. Using a 90° builder's square or triangle, draw a
1/2" [12.7mm] long line on the aileron straight back from the
servo arm. Take note of the hardwood block that is below the
surface of the covering. You will drill into this block next.
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10. Center a large nylon control horn over the line
you drew so that the pushrod holes in the horn are directly
over the hinge line of the aileron. With a 1/16" [1.6mm] drill
bit, hold the horn in place and drill two 1/2" [12.7mm] deep
holes using the holes in the horn as a guide. Be careful not
to drill all the way through the aileron. Wrap a piece of
masking tape around your drill bit 1/2" [12.7mm] from the tip
to help you know how deep to drill.
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11. Install the control horn using two #2 x 1/2" [12.7mm]
sheet metal screws. Remove the screws and the horn and
harden the screw threads you created with a few drops of
thin CA. Reinstall the control horn.
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12. Fit a nylon clevis to a 12" [305mm] one-end
threaded pushrod so that the end of the threaded rod extends
1/8" [3.2mm] into the clevis barrel. Fit a silicone retainer onto
the pushrod as shown.
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13. Fit the clevis to the outer hole of the control horn.
With the aileron servo and the aileron centered, mark the
bend line at the outer hole in the servo arm.
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14. Bend the pushrod wire 90°. Clip off the excess
wire so that the bent section is at least 1/4" [6.4mm] long.
Connect the wire in the outer hole of the servo arm and fit a
nylon Faslink ™ to hold it in place. Make any fine adjustments
by removing the clevis from the control horn and turning it in
or out to shorten or lengthen the pushrod. Slide the silicone
retainer in place over the arms of the clevis.
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15. Repeat steps 1 through 14 for the bottom right wing.
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16. For the next few steps, cut up some paper towels into
1/4 sheets and have some denatured alcohol on hand to
clean up any epoxy.
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17. Epoxy the two 37mm x 8mm wing dowels in place
so that at least 3/8" [9.5mm] of each dowel extends forward
from the leading edge.
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