Great Planes U-Can-Do 3D 60 ARF - GPMA1270 - Manual (Page 12)

How to cut covering from balsa.
To avoid cutting into the balsa, use a soldering iron instead
of a hobby knife 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 move to melt a fine cut.
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7. Apply 6-minute epoxy to all joining surfaces of the fin. Fit
the fin in place, aligning the TE of the fin with the TE of the fuse.
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8. Test fit the nylon tail gear bearing with the tail gear wire
into the slot in the rear of the fuse.
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9. Use a hobby knife or a 5/32" [4mm] brass tube sharpened
on the end to cut a groove in the leading edge of the rudder to
accommodate the nylon tail gear bearing. Drill a 1/8" [3.2mm]
hole into the rudder for the “arm” portion of the tail gear wire.
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10. Carefully apply a small dab of petroleum jelly to the
top and bottom of the tail gear bearing where the tail gear
wire goes through the bearing to keep glue from entering.
Apply 30-minute epoxy inside the slot in the fuselage for the
tail gear bearing and to the hinge of the tail gear bearing.
Install the tail gear bearing and wipe away any excess epoxy.
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11. Test fit the rudder to the tail gear and the fin using three
CA hinges. Repeat until you are satisfied that the rudder fits
properly. Apply epoxy in the rudder for the tail gear wire. Fit the
rudder with hinges to the fuse and wipe away residual epoxy.
Apply 6 drops of thin CA to both sides of each hinge.
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