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