Locks
Hello,
These types of turnbuckles usually do have a locking mechanism, in the form of a set screw that engages a radiused slot in the barrel. The kind you show might be ones that have only one threaded end, the one on the wire, so the effect of torque is minimized. That is, the barrel can rotate, but it is a bearing, not a screw, so if the wire torques, it can only loosen the wire stud, and that not far.
I don't like these turnbuckles, having had trouble with metal cracking adjacent to the set screw, and internal corrosion. They also seem much harder to take up than conventional turnbuckles.
Fair leads,
Brion Toss
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