Method - I bent the end into a U shape and clamped the U between two pieces of wood. Holding with pliers, I bent flat one side (count 1) and flat the other side (count 2) and repeated until the wire broke.
Seeing as we only form the wire once, plus a little bit of sideways tweaking to tune the lure, I am not concerned about cracking. You can easily perform the same test on your stock for comparison.If the wire broke after 4 or 5 bends, I probably would be concerned. Let us know what your results are.
Dave
Dave results of my wire test, not controlled but probably a good sign.
Wire Type 316LSi except for the .9mm(.035") unknown.
.8mm (.031") Average breaking point 46
.9mm (.035") Average breaking point 34
1.2mm (.047") Average breaking point 25
1.6mm (.063") Average breaking point 37
For the sake of the discussion take six bends of each average, so the lowest number would be 19. If I hade to tune a Lure 19 times I would be making some terrible lures, I'm fighting some mean fish or I'm not fishing hard enough. All up I think the safety margin is good, might have a failure from time to time as not everything is constant.
Cheers and thanks for everyones contribution.