It's just the way they are assembled. They don't take the time to align the idler wheel. Doing so is kind of trial-and-error and they can assemble another bow in the time this takes.
Originally Posted by guntercb
You're going to find that what we call cam lean is actually the limb tips being twisted to the side that the cable guard and slide are on. The yokes on the cable are the same length. The yoke going to the oppostie side as the cable guard needs to be longer to straighten out the idler. Well, strings aren't made that way so what you have to do is twist up the near side yoke to make it shorter.
It's most prevalent in single cam bows, but almost all bows with a cable guard are susceptable to it. Some are worse than others. The only way you get totally rid of it is to get a bow with a shoot through cable system like Martin's X cams.
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