I purchased a Dutchman boom brake
(model BB500) last year but have a problem using the recommended line.
The owners manual specifies a diameter of 11mm (7/16"). However, I've found that a line of that size jams on itself inside the brake. There just doesn't seem to be enough clearance between the top pulleys for the line entering from one side and exiting the other.
The net effect is that I can tension the boom on one side (i.e. the side from which the line is led back to the cockpit) but not on the other.
Has anyone else encountered this problem or am I doing something wrong?