Great Planes Waco YMF-5D Biplane ARF - GPMA1295 - Manual (Page 15)

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4. Remove the two 3mm wheel collars and the tailwheel
from the tailwheel assembly. Grind two 1/8" [3.2mm] flat
spots on the axle so that one is centered 1/8" [3.2mm] from
the support arm and one is centered 7/8" [22.2mm] from the
support arm.
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5. Reinstall the wheel and the wheel collars. Apply one
drop of thread locking compound to the locking screw
threads and tighten the locking screws against the flat spots
you created on the axle.
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6. Prepare the three CA hinges for the rudder by inserting
a T-pin through the center of the hinge.
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7. Test fit the hinges and the tail wheel into the pre-cut
slots in the fuselage. Test fit the rudder onto the hinges and
onto the tailwheel guide wire. The rudder hinge line should
have only a small gap with the T-pins holding the hinges
centered. Use the back side of your hobby knife to dig out the
hinge slots if you can’t fully insert a hinge.Slide the rudder
up or down so there is just enough of a gap between the
fin and the rudder counterbalance to allow full rudder travel.
Remove the rudder from the fin.