Simple as tightening a tent line. A bit pricey, and the short/tail version is not in stock.

As soon as I pulled these out of the box I was skeptical. One of the ropes was frayed and the tightening mechanism did not inspire confidence. But, I thought, “they must work better than they look�. As it turns out, they don’t. The first time the plane was exposed to a significant wind with these tie downs, both wing tie downs loosened off, and one loosened off so much that it detached from the ground anchor. If you need a tie down that will actually do the job when it counts, find a different tie down. I’ll be returning these to Aircraft Spruce because they can’t be trusted to hold when they are actually needed.