Usually turnbuckles are not used to bear load, but rather in tensioning guy wires, etc. Shackles are often used with locking hooks to connect between wire rope and nylon harnesses or rope. Very close attention should be paid to the load capacity of the hardware being used. Often times, items purchased in a typical hardware store are not rated for load, and thus shouldn't be trusted for load-bearing applications. Specifically, no warranty is expressed or implied regarding the accuracy of the information contained within.
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