Rope technicians have access to more instructional opportunities than ever before. Courses, books, online references, and videos mean that skills including speed rope ascents, passing knots, use of new devices,

Can we rely on devices to slip on ropes at predictable forces given the possible range of physical and environmental conditions? Here we test the Petzl Shunt on several

Technicians have always had a wide range of methods and reasons for tying-off descenders. Traditionally this was because they wanted to use both hands for another task and Munter-hitches, Figure8