I have an FF2 furler that I am getting ready to install on my M-17 (when the weather warms up a bit), and agree that it installs over the existing turnbuckle, it looks like with no problem. I did have to get a new headstay above the turnbuckle, however, since the FF2 instructions require toggles (that is, as it was explained to me, freedom to move both fore and aft and side to side) at both ends of the headstay, and the stock headstay on the M-17 has a single aircraft eye at the masthead end. It's not clear to me why this is necessary, but CDI says it's important. Maybe someone can explain the physics? Why does a furler put different strains on the forestay than a hanked-on jib? The FF2 installation instructions, which are quite comprehensive, are downloadable from http://www.sailcdi.com/sailpdf/FF2 manual 7_06.pdf. Good luck, Rick ************** Biggest Grammy Award surprises of all time on AOL Music. (http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp00300000...)