... link to a part of our web site here; http://www.americanriggingsupply.com/Spinlock_XTS_XCS.pdf
and on page two in the part of the Spinlock Catalog found on our site you will see where it reads; "We design these clutches to be assembled onto the line to overcome the difficult problem of loading an endless mainsail furling line. XTS0608/1M, XTS0814/1M, XTS0814/2M, XTS0814/3M"
I hope that helps...