It seems there is some confusion about my question, sorry about not being clear.

I do have a rotation arm as described by bruce, it is indeed a stock item.

What I do not have are the two lines, one each side of the boom that run through a alu cleat limited by a black ball.

The manual for "Inters and F18" states:

Tie the 5/16" rotator limiter lines to the diamond turnbuckels and lead them back to the clam cleats on the boom, and install the stopper balls.

It them goes on the explain the rotator setup bruce described.

I am stil not sure weather I would need them or not. I have noticed that the mast does not easily rotate to 90 degrees I have to force them by hand, especially with light winds. More wind makes the angels easier to setup.

I also find that they are not so easy to adjust while trapping.


Thanks for all you time and info,

Martijn