Feeling Rather Spoolish

Apparently, the spooling system we have now isn't quite working as expected; it has a tendency to fray the string. So, I went off to SolidWorks to draw up a concept for a new one.  Unlike the last spool – which was mounted on the side – this one goes between the two bars in the arm, meaning that it's a more direct route for the string than before. In addition, the string uses the arm's axle as a pivot, meaning it will always be the correct length regardless of what angle the arm is at. Pretty nifty, I think.