The typical turnbuckle safety wire is designed to prevent inadvertent
unscrewing of the turnbuckle, either from vibration or random vandalism.
It's not to support the tower in the event of a turnbuckle failure. That
would at least require more than one in-line cable clamp.
Note: I've NEVER seen a turnbuckle prone to unscrewing itself, but don't
consider that a reason to not use them.
The turnbuckle shouldn't be the weak link in the system anyway. It
should be oversized and of good quality to insure that the threads
remain in good operating condition.
-Steve K8LX
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