If you are looking for a simple gizmo to tighten your guylines, look no further. The awesome ITW Nexus Lineloc 3LL for Tarps, Tents and Shelters that use guylines. Simple to adjust with excellent holding power. 1.3 grams each. 
 
Fantastic piece of gear for self-tensioning your Tarps, Tents and Shelter guy lines. Suitable for 2.5-3mm lines (you can use with some narrower diameters in our experience).  Sold as sixes.