… as close to a drop-in replacement as you’re going to get,” said Scheps. Carbon fiber composites, which a student asked about in the online forum, are a much more complicated solution … as close to a drop-in replacement as you’re going to get,” said Scheps. Carbon fiber composites, which a student asked about in the online forum, are a much more complicated solution … as close to a drop-in replacement as you’re going to get,” said Scheps. Carbon fiber composites, which a student asked about in the online forum, are a much more complicated solution …