Harken batt car system. It is a pretty expensive upgrade, but would allow you to leave the old track in place, and really works amazingly well. For a mast that size probably around $2,000 if you do the installation yourself (really easy process, though if possible do it while the mast is down. The ball bearing races allow easy reeling even when reaching or running. So long as the sail is not actually pressed against the shrouds.
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