Hi Dave: I forgot to give you the info on "How to attach the sail slides to the Extenion". My sailslides come off a Pearson Ensign Main . The slide is plastic with a ss bail embedded in it. It is about 3/4 ",rod shaped (the length is not important the diameter of the slide is critical because it must slide up & down withoutgetting caught in the mast slide track . It fits perfectly into my mast track . The bail is attached with a very small shackle to a hole in the extension. When I first set up the extension I used a plastic sail slide that was too big for my mast track so i ground it down to perfect size . Good luck ! Bill