The workers at the Ballard locks in Seattle used to use these because of some safety regs (for a short while). They all hated them because they jammed up all of

The workers at the Ballard locks in Seattle used to use these because of some safety regs (for a short while). They all hated them because they jammed up all of the time. Wish I knew the name of the mechanism they used, it looked interesting enough to get me talking to one of the workers about it. Edit- the best I can find is either something called a 'starpass glider' mentioned on page 14 of http://s7d9.scene7.com/is/content/minesafetyappliances/Horizon%20Horizontal%20Lifeline%20Instruction%20Manual%20-%20EN http://s7d9.scene7.com/is/content/minesafetyappliances/Horiz... or http://www.saferack.com/lifeline-cable-systems-fall-protection.cfm http://www.saferack.com/lifeline-cable-systems-fall-protecti... The system I saw at the locks seemed like a better engineered system, from what I remember.