My 135 Furling headsail has come apart. The threads on the leech deteriorated and the leech line was exposed. Took it to a local place to have stitched and we noticed some more on the luff. I don't know how old the sail is but it seems in decent shape and the PO said it was only a few years old. It is a Rolly Tasker sail. Is that normal for threads to deteriorate within 10 years assuming it is that age?