Dear Lester,

The problem is very easy to solve. You have to do 2 things.
The first thing is to put 1 rope from the mast controler to the side stay on one side and 1 rope from the mast controler
to the other side to fix the rotating movement.
Th seceond thing you must do is to throw a rope over the diamond spreaders around the mast and then tie this down to the rearbeam with a little tension. The rope (5 mm) is now changing the frequence everytime the mast starts occelating.
I am using a carbon mast on my boat and use this trick for almost 6 to 7 years now and it works perfectly.

Thanks,

Klokkie
Ned-7 / Blade F16 distributor