Originally Posted by shappattack
That knot only gives you a loop in the middle of a line to attach a block to and it is a very good knot for that purpose. if you need to make more than 1 haul and re-adulst your blocks in a z-drag scenario then you will need a rope-grabbing knot, like a prusik, or mechanical rope grab device before you can let off tension and re-adulst the system, unless you have a secondary main line to the boat to tie off as a temporary anchoring line while you release the z-drag tension.
That linesman's loop's all you need to clip on a pulley mid-rope. Just hope ya got enough rope tho! No need for additional anchor lines, just don't drop the one you're gonna run thru the z, if you need to slack and reset.
I just like the ease of that knot, and that it doesn't bind up under a load....
Thankfully, I've only had to do 1 z-drag in a practical scenario in the past couple years.
We did have to release tension and reset the knot for more space between pulleys. Only once tho
Someone had a Petzl rope grab device down there. Under the right circumstances I could see it being really useful...
They didn't have it out before we got the boat tugged off the rock.
But I looked at it and really liked it, kinda wanna get one for my kit.