a beautiful boat should sail forever.
The grooved and flanged track (available as Schaefer sail track for around $100 per 12 feet, but the shipping costs more than the track!) is very robust, as indicated in my last album of "repairing damaged mast track". Anyway, the lucky break is that you can clamp a piece of track on, and the string, with care, still works in the groove, allowing one to drill the new holes. A KEY IDEA is that the string allows you to pick out a few perfect old holes (3 or 4) per twelve foot piece of track and screw the track in, perfect at those chosen locations The one hole showing was originally perfect, so I just keep checking to make sure it is perfectly centered.