Basically a newbie in that I am picking this up for fun and tentatively some side work with arborist friends, that being said with limited funds at the moment I have been checking out this F8 Revolver as opposed to dropping on the rope wrench quite yet with SRT. So I have used this method on a thinner rope (8.7mm) with a Edelrid Carabiner (with the Steel running edge) and a 1.5" inner diameter Aluminum ring and the friction/slide on the decent was smooth, but still created enough of a bite to slow descent. Now here is the catch, I finally got REAL climbing rope for a steal (200 ft of Blue River Safeline for $60 brand new), but it is 12.5mm, which means my ring is WAY too small. I found a link that was able to fit the line, but even then with the biner, it end up creating an occasional kink when descending, and it's opening was 2.25 inches, but also shaped like a Link, not a ring. I love the simplicity of this for helping on descent, so hoping someone may have experience with the F8 Revolver on some BIG line, XD.