I was messing with my LT-40 ARF today and noticed that the leading edge of the horizontal stabilizer was flexing more than it should. Thinking the wood might be broken I trimmed away the covering and determined that the wood was not broken but that it had a "crease" in it. Should I replace that small part of the leading edge or should I just cover it up and not worry about it? If I should replace it what size balsa stock should I use to replace it with?