Which device is used to loosen or fasten the securing hardware for lifeboats?

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Controlling tension on securing lines is essential to keep the lifeboat firmly in place while allowing quick release when needed. A turnbuckle is the device designed for loosening or tightening such lines. It has a threaded body with two end fittings that attach to the securing points; by rotating the body, you lengthen or shorten the effective distance, pulling the lines tighter or letting them slacken. This makes it easy to snug the lifeboat against its securing points or loosen for deployment. Wrenches are tools used to turn fasteners, but they don’t provide the built-in adjustable tension feature. Pulleys change the direction of force and help with moving lines, not adjusting tension. Bolts are fixed fasteners that join components and are not the adjustable mechanism used for lifeboat lashings. Therefore, turnbuckles are the appropriate device for loosening or fastening the securing hardware for lifeboats.