We just replaced all our shrouds (2 -3 years old) and diamond wires on our Nacra 6.o NA after finding several broken strands on the timble of the side shroud. Also replaced the diamond spreaders with new stainless steel spreaders, as the old ones were corroded. Went out today in 20 knots and 3=5 ft waves, confident in our new gear.... and down came the mast . The rod tensioning the bow foil broke at the edge, where it is welded into a T shape.
Lesson learned - it's what you don't replace periodically that gets you

Opher
Nacra 6.0 NA
Israel