Thanks for the replies...
Yes, I do mean adjustable on the fly using strings from the cockpit. As I mentioned I don't want to leave the cockpit when out there. And while I have made do with setting the car position on the day for the day my sailmaker demonstrated with the new working jib how moving the car forward when off the wind and when the headsail is partially furled improves efficiency. Yes, I could make do, as I have done, with one position come what may but while perfection is not my goal continuous improvement keeps me off the streets,
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