Screw pin shackles are convenient for rigging in the field; you can (usually) tighten and loosen them with just your hands, so if you spend a lot of time moving things around the jobsite, they're a real time-saver.
Occasionally, the paint gums up the threads, especially in newer shackles. If this happens, any thin pointy tool can be inserted into the hole in the screw pin to help provide leverage. Just make sure the pin is all the way in - the collar of the pin should be flush with the body of the shackle and fully seated.
Here, we rigged up a basket hitch just to show off the shackles. If you're curious about the setup: we used a twisted-eye web sling, a round sling, and two screw-pin anchor shackles. Note how the slings are both wrapped around the master pins in the test bed, which are equal in diameter. This ensures the sling sides are fully parallel (0 degrees, no angles introduced). This is a critical detail for achieving the full strength of a basket hitch. In the field, a setup like this would most commontly be used to extend a sling that's too short, but the hitch isn't our focus today.
Remember, the Working Load Limit (WLL) will only be as great as the weakest link, so make sure you check the ratings for each component when rigging up a solution like this.
How do you use screw-pin shackles?
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