I tried a couple of Spanish Ring Knots, using leather lace, on either side of a Turk's Head knot, on my Surefire flashlight. You can see a diagram for the knot in 'How to Make Whips' by Ron Edwards. The Amazon page shows the diagram when you click 'LOOK INSIDE' and check the 'Excerpt' section for the book. The knot is also in another book, that I have, and was easy to find when I knew what I was looking for.
There's a tutorial on the Knot Heads World Wide website, posted by Bud Brewer, with another pass around the knot, The Woven Ring Knot.
I use whatever's handy to try out a knot.