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Hello,
You are right; because elasticity is not a factor, and because the jibstay will tension the bobstay, there is no need for a turnbuckle. This assumes, of course, that you make the bobstay exactly the right length. It also assumes that there is enough flex in the bowsprit that you can bend it down (with the jibstay slack) to connect a fixed-length bobstay.
If those two variables can't be met, you could use a turnbuckle, but it would be the heaviest, most expensive piece of hardware in the rig, so how about using a Spectra lashing instead? You can easily get far more strength than with a turnbuckle, and far less weight, so less pitching moment. Cheap, too.
Fair leads,
Brion Toss
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