Power ascender.
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Previously:
https://www.homemadetools.net/forum/...091#post160844
https://www.homemadetools.net/forum/...634#post147567
https://www.homemadetools.net/forum/...617#post118012
https://www.homemadetools.net/forum/...341#post150569
https://www.homemadetools.net/forum/...088#post149532