Acebeam L10 Mini(1AA), and added some knot work to it. I'd mentioned the light a couple of days ago on another of my blogs, "Nothing to see here, move along."
I tied a 5 lead 4 bight Turk's head knot to start (the gaucho knot in the video starts off that way). Then raised/expanded that knot a couple of times, expanded into a 7x6 TH knot and then raised again with same method into a 9x8 TH knot, although I do it without the mule, that's still a good way to learn. And then I worked in the gaucho interweave, carefully trying to keep the knot neat as I tightened it up, working the slack out.
I had started with a previously cut six foot long length of cord, which I was thinking I could get a couple of knots out of, and used about three and a half feet in the finished knot, leaving a scrap that I'm sure to find a pen or pencil to victimize with. I may add a paracord lanyard to the light if I don't end up keeping it clipped on my keychain...
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