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I would caution you to consider the effects on weight and balance when you make significant changes to the weight of the aircraft, particulary when you change rudders and elevators. Another thing to consider when you go to change flight control surfaces is the possible effect of flutter on the changed mass of the units.
Twin Commanders have a new SB, SB235 that directly affects composite units. You might want to take a look at that. In addition, it calls for checking the mass of the units, since weights or paint may be applied that changes the overall weight of the unit, and that affects it's resistance to flutter.
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