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Hard telling not knowing correct me if im wrong, but in the second pic it looks like his tip fc sling and biner is a none locking biner. Steal toe hiking boots is all I'll wear to work. And im prettt sure top handle saws are desighned so well balanced to be run one handed when need be!
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Sure it's a non locker. Same as rock climbers use for every protection placement when on lead. Look again, that sling is just there to assure that, if the lifeline came off the two stubs that Mickey has it around, he'd still be crotched in..with at most a 4 foot fall.
Don't like steel toe boots...besides, there's too many great hiking boots to choose from, and none are normally made with toe protection.
One handed use has been beat to death....in the arb mags as well, lately. good not to teach beginners the practice....but in the real world, it's the only way to fly. With some trees, where only a few cuts need to be made, it isn't needed. But with a run of the mill conifer removal, (or any tree with tons of small limbs)
where speed is key, it is physically impossible for anyone, no matter how competent, to even come close to getting the job done as quickly and efficiently using two hands as with one.