Do people use those loops? I cut them off and sometimes the first foot of useless level line off too.
It takes me about 15 seconds to tie a nail knot using my double-ended needle waist deep in the water, which I need to do once or twice a season if that as indestructible as the simple nail knot is. I don't even bother with a loop connection since it's just as quick to tie a blood knot just like the other joints on my hand-tied leaders.
For me a line is judged by it's casting, coating (buoyancy, durability, dirt repulsion, etc) and core.
Like Walt said... how's the line?
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