Interesting. Can't tell for sure how it works. Looks like it climbs the cable when going up.
https://www.youtube.com/watch?v=LwqenonGKAc
https://www.youtube.com/watch?v=dwnj_ubpj6k
https://www.youtube.com/watch?v=WQh-H9o3vPo
Bruce
https://www.youtube.com/watch?v=LwqenonGKAc
https://www.youtube.com/watch?v=dwnj_ubpj6k
https://www.youtube.com/watch?v=WQh-H9o3vPo
Bruce
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