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I noticed that either cord diameter works equally well for friction hitches. It all depends on cord construction, cord length, climbing style, body weight, rope construction and finally personal preferences.
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Well put! --and maybe also on the rope you're hitching to, as well as
there likely being some variations per hitch to adjust either dia. cord to
work acceptably well.
Which is why I encourage a sort of full disclosure (i.e., details as suggested
above) when discussing such preferences--what hitch in what cord on what
rope for what weight one is preferring to < ditto > , < ditto >, ... .
Patterns show up better this way.
*knudeNoggin*