Gibbon Slacklines Lever Chain Hoist
Disclaimer: we do not actually encourage skyscraper traversing.
Gibbon's Lever Chain Hoist makes it possible for one person to tension long lines up to 330 feet long. An included attachment strap, chain connection, and durable shackle combine for a ready-to-use system that boasts a 50:1 gear ratio (hence the ability of one person to tension long lines). Don't forget this crafty tool the next time you and your buddies plan to do a publicity walk between two skyscrapers.