Thanks. You are correct, there are only 2 sliders. However, there is provision for 4 lines and I was advised by a Selden supplier that you can run 3rd and 4th lines under these sliders along the inside of the boom and drop them down to a turning block. I was hoping someone has already done this and could advise. I don't use 3rd reef regularly but have been out in F7 twice recently thinking it would be nice to be able to reduce sails a bit more :-) !