Andersen Hitch Inc. has designed a new ball, cone and triangle plate for the weight distribution hitch. This new design was to create a ball that would not lock up inside the collar and/or cause noise when turning. For more information or data on results and testing you would need to speak directly with Andersen.
Any customer who has an older Andersen Hitch setup can upgrade to the new design for $100 by contacting Andersen directly and asking about part# 3332 and explaining the issue that you are having with the current ball. The $100 upgrade is a discounted price but it will not last forever.
Andersen Hitch Inc.
208-523-6460
800-635-6106