Great Planes SU-31 3D ARF - GPMA1412 - Manual (Page 15)

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10. Attach the rudder in the same manner.
Install the Tail Gear Assembly
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1. Trim the covering from the fuse for the tail
gear bushing.
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2. Apply CA or epoxy to the outside of the bushing and insert
the bushing into the hole by gently tapping it into place until fully
seated. Be sure not to get glue into the hole in the bushing.
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3. Measure 1-1/2" [38mm] back from the LE bevel of the
rudder and make a mark on the underside center of the rudder.
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4. Use a 5/32" [4mm] drill bit to make a 1/2" [13mm] deep
hole at the mark. To improve accuracy, drill a smaller pilot
hole at your mark fi rst.
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5. Slide the tail gear collar and nylon retainer onto the
tail gear assembly as shown. If necessary, use a 1/16"
[1.6mm] drill bit to enlarge the hole in the retainer for the tail
gear guide wire.
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6. Temporarily insert the tail gear assembly into the tail gear
bushing and the nylon retainer into the hole you drilled in the
rudder. Center the tail gear bracket onto the fuse over the tail
gear collar and mark the location of the mounting holes.