add tang for running backstay to existing throughbolt?

[mholmes]

I have a valiant 40 1978. We just redid the rig with 1x19 316 stainless, including the intermediate backstays because we had already ordered the wire and fittings (about which we have had numerous valuable conversations in this forum).

We're going to add 5/16" amsteel blue running backs. I want to know whether I can add a second tang on top of the intermediate's tang using the same throughbolt, and keep BOTH the old intermediates and have running backs too. That way we'll have intermediates for when we're lazy and running backs for serious weather. I don't see why the extra tang on the same bolt would be a problem, but I also don't yet trust my intuition on these matters.

I know what you're going to say: that it's way overdoing it to keep both, and that it negates the benefit of having running backs (to let the boom extend closer to the shrouds). But I also read a quote in the Apprentice that went: "nothing too strong ever broke".

but sharing the one throughbolt for both tangs: ok or not?

much appreciation for all the superb advice,
matt