Question. Are you saying the cable has a floating yoke like on Hoyt bows? If so then ther is nothing you can do to straighten the idler. You can twist up the right side of the yoke, but as you shoot the bow a floating yoke system will just self center itself again.
Me? I'm picky about such things and consider idler lean detrimental. I always take care of this before I even set the bow up, or should I say it's part of the initial setup.
You can try it as is and see what happens. Nothing to lose at this point.
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