GREAT PLANES Extra 300S Instruction Manual page 12

5. Test fit the rudder to the tail gear wire. View the
rudder and the tail gear wire from above (when the
fuselage is upside down in your cradle). If necessary, bend
the tail gear wire so your model will taxi straight when your
rudder is centered.
6. Mount a 1" tail wheel to the tail gear wire with a 3/32"
wheel collar and set screw on both sides of the wheel.
Secure the set screws with a drop of Great Planes Pro
Threadlocker (GPMR6060) or similar thread locking
compound.
7. Use the sketch above to make two wheel pant
mounts from the 1/8" x 1" x 2" plywood sheet.
8. Use 80-grit sandpaper to scuff the inside of both
wheel pants where the wheel pant mounts are to be
located. Glue the wheel pant mounts inside the wheel pants
with medium CA.
9. Use a metal file to round the edges of the landing
gear where it keys into both wheel pants. Fit one of the
wheel pants to the landing gear, then mark the hole in the
gear onto the wheel pant. Mark the other wheel pant using
the same procedure.
10. Drill a 3/16" (or 11/64" or #18) hole in both wheel
pants at the mark you made.
11. (Refer to this sketch for mounting the wheel and
wheel pant on the landing gear.) Fit a 2-1/2" wheel on a
8-32 x 1-1/2" axle. If the wheel does not fit on the axle or
spin freely, enlarge the hole in the wheel with a 11/64" or
#18 drill. Screw a 8-32 nut onto the axle about 1/8".
12. Slip the wheel with the axle and nut partway into one
of the wheel pants.
13. Use a 9/64" hex wrench to screw the axle into the
plywood wheel pant mount until it comes out of the opposite
side of wheel pant.
14. Use needle nose pliers or hemostats to tighten the
nut inside the wheel pant until free play on the axle is
removed, but the wheel can still roll freely.
15. Fit the other wheel into the other wheel pant using
the same procedures as above.
16. If you wish to polish or paint the pre-bent aluminum
landing gear, now is the time to do it.
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