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This video was awsome bro! Thank u , that def opened a whole new cascade of ideas and plans , thank u . I had already formulated a good plan , but I can def use this trolly system at some point .
This works to but then you need to run 2 portisI often feel that a floaing lowering point is un-needed. I generally opt for two lowering lines, one in each tree, or one as a butt tie to the spar I'm working on.
Typically when we do it west coast two person crew style the butt hitched side is ran by the climber by stub or a trunk wrap. Doing this you really want the piece to swing away from the climber, and the butt hitch is more of a control line than a lowering line.This works to but then you need to run 2 portis
Another option is to snub off one end run the line across to a block or ring to a tree on the other side and down to a porti. Then one sling to tip tie and attach midline, cut it off and the weight should pull the centre down in the middle. Can be harder to aim but KISS!
1 rope, 1 porti, 2 slings. Done.