Jeffers, I can't keep a top section straight for more than a days sailing at the moment! Bottom sections (radial) are not much better, I seem to get a few months out of them tops before they bend. The top sections I've had recently just seem really weak. It doesn't have to be particularly windy for them to bend. At the moment I straighten my mast (I have 2 top sections at present, one has been end for ended, one hasn't yet) before every sail and its bent after every sail.