I just had a spreader break on my N6.0na, and that caused the mast to break. The front adjuster screw sheared right at the Y. The only cause I can think of is metal fatigue when I had the spreaders go up/or down and had to slightly close the Y with pliers. I think this caused metal fatigue. I would recommend that if in doubt, get a new spreader kit and then tie the spreaders tight to the diamond wires with several short stainless wires..
Dave,
For a short period, there was a problem with the 6.0 spreaders where the threads of the adjustable part were threaded too closely to the slot milled out for the attachment to the mast. It took too much meat away resulting in occasional failure. I'm not sure if there was any factory warrantee on that or not (probably not).
PTP,
The Nacra spreaders have a good deal of play up and down - we could move the Nacra 20 spreaders up and down 3 to 4" as measured at the tip with no diamond wire tension. This is not a problem as long as you keep them perpendicular to the mast when tightening the diamonds. You should always have at least 300 to 400 lbs of tension on the diamond wires which should easily keep the spreaders in place...chances are that your diamond wires are too loose. A little retaining wire won't hurt either.
