From TowerTalk: For your next tower project. - Bill W2CQ https://www.youtube.com/watch?v=eepAtIXFUIw http://www.actsafe.se/product/acc-power Very cool way to climb a tower (up to 350 meters!) rigged with the hoist and a safety line. Note the self tailing/locking rope grab on the safety line. Grant KZ1W