I’m new to this so bear with me. I am trying to attach my ART positioner to my lanyard. When I installed it on my flipline it slides up and down easily. Did I install it wrong? The positioner says it’s good for wire core flip lines 11-13 mm. I have this flipline https://www.treestuff.com/store/catalog.asp?item=1093 it’s 1/2” so 12.7mm. It should work right?? What am I doing wrong?