Strength
Hello,
That is correct: nothing too strong ever broke. That is exactly why you don't want to put both stays on one bolt.Consider that the loads will be highest when you are driving to weather. If you are not lazy, you will take up on the runners, but those intermediates will still be loaded, just from tune. You now have more load on the bolt than before. Likewise consider that the runners, if they are outboard, will be pulling on a longer lever arm than before, by the thickness of the intermediate tang. Yet more load. Finally, if you will, consider why you are even raising this question. I don't know why you are asking, but it doesn't sound like it's based so much as in engineering as in something else entirely.
If you must keep both stays, put the runner on its own bolt. The bolt itself is the only cost difference, and you get a distributed redundancy out of the deal.
Finally, consider sailing with those intermediates dead slack, and see if they make even the least bit of difference 3/4 of the time.
Fair leads,
Brion Toss
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