Taught Line Hitch

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This knot is relatively easy to tie for lashing and makes adjusting the sling line length very easy, without having to re-tie the knot each time. All one has to do is release the line from any tension and then slide the knot to the desired position. It will require you to keep an eye on it, since any action of the secured object (e.g., flapping tarp) can cause the knot to start loosening up a little bit, which can eventually lead to it coming apart.