Aircraft Modelers Research Extra 300 Mid-Wing Manual - page 6
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alcohol. EG also recommends scuffing up the plastic
3. The holes for the supplied hinge points are predrilled. Locate the hinge points and dry fit the hinges
and rudder into place and test the operation. The hinges should seat fully into the holes so that the hinge
line gap is minimal while still allowing full rudder deflection.
4. Before gluing the hinges in you must first clean the hinges of any mold release agent using isopropyl
with light sandpaper for maximum glue adhesion.
5. Mix up some 30 minute epoxy and using a toothpick or small wooden dowel coat the inside of each
hinge hole with epoxy. Also put a thin layer of epoxy on one side of the hinge points. Install this end into
the holes of the rudder and make sure each hinge is properly aligned at exactly 90 degrees to the hinge
line.
6. Now coat the other end of the hinge points with epoxy and install the rudder into the trailing edge of
the vertical stabilizer. Again, make sure the hinges remain in proper alignment. Using paper towels and
some isopropyl alcohol clean off any excess epoxy from the hinges and surrounding areas.
7. Make sure the rudder is fully seated so that the hinge gap is minimal while still allowing full deflection
of the rudder. When satisfied, use some masking tape to hold the rudder in place along the bottom and
counterbalance. After the epoxy has cured, remove the masking tape and check for proper operation. If
the hinges are dry some light oil carefully placed on each hinge will help greatly.