Sure, but not sure the rolling friction of bearing on plastic and bearing on bearing race would be less than the current magnet sliding on teflon. It's also a

Sure, but not sure the rolling friction of bearing on plastic and bearing on bearing race would be less than the current magnet sliding on teflon. It's also a fair bit of complexity, weight, and expense. Not sure how long bearings would last in the relatively corrosive environment of chlorinated water.