result in poor performance and unsafe working conditions. “Tree work is extremely complex and many factors are beyond anyone’s con- trol, so being able to adapt to chang- ing conditions is essential,” Hanrahan continued. “If you are only capable of climbing with a mechanical device, you won’t be able to adapt to the situation if your device can no longer be used.” BEST OF BOTH WORLDS Experienced climbers rarely rely on a single technique. In fact, many arbor- ists learn to use hybrid climbing sys- tems that combine MRS with SRS or mechanical devices with friction-based systems. This combination allows climbers to capitalize on the strengths of each system and ensures they have a backup plan at the ready. “I don’t have a strong preference for [MRS or SRS], generally,” Hanrahan reflected. “Each has its advantages
periods of time in the canopy. Not to mention, aluminum alloys, stainless steel, and machined components are all able to withstand heavy use required for career arborists. However, mechanical devices are not without limitations and there is a cau- tionary tale to keep in mind when us- ing them frequently. “I strongly prefer hitch cords over me- chanical hitches, primarily for safety reasons,” Hanrahan shared. “There have been several incidents of arborists using these devices going into sudden free fall, usually because they are drag- ging tail. […] The tail could wind up tan- gled in branches in the drop zone, or snag on part of the tree unexpectedly. A groundie may also pull down on the tail without warning.” Mechanical hitches also require ex- tensive training to be used effectively in conjunction with other techniques. Misuse or reliance on these devices can
Runner Pro, as well as the Petzl Zig- Zag and the Pantin Click Ascender can dramatically improve efficiency and re- duce fatigue. Levi Williams, ISA certified arborist at Tree Scouts Tree Service, shared his insights on how these devices create a segue from traditional friction hitches to mechanical ones. “A mechanical Prusik device such as the ZigZag was made to replace traditional hitches such as the Blake’s hitch,” he re- called. “This system is used with DRT, usually. It’s a very reliable system that helps with rope slack management and precise device lock movements.” Another advantage of mechanical de- vices is ergonomics. Many devices have been designed to be used with one hand, which allows climbers to achieve better balance and control. Mechani- cal devices also do a lot of the heavy liing, which can make an incredible difference for climbers who spend long
38 | Spring 2026 ArborTIMES ™
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