The guys at RVOps in the UK publish a lot of really great gear reviews and how-to videos on YouTube. Here's one that caught my eye last week about how to use LineLocks, an ultralight guy line tensioner. I've owned these for a few years and never could figure out how to use them, but this video inspired me to try them out last weekend on a 3-day trip where I used them with a silnylon tarp hung over a Hennessey Hammock. They worked great with Kelty Triptease guy lines.
Mountain Laurel Designs in the states sells LineLocks if you want to give them a try. Each mini LineLock weighs just 0.05 oz, which makes them a great ultralight tarp guy line tensioning solution.