I went to purchase a FF2 CDI Furler for the Mac 26x. CDI luffs are no longer in production and I have searched everywhere starting of coarse with Blue Water Yachts. I can get the all the hardware but no luff available. The FF4 is a little bigger but accommodates the same forestay specs and #6 sail luff size etc.... Besides the luff being 4 pounds heavier and a bigger cup is there any other reason why I couldn't use the FF4?