Our club President, Rick Manan, has asked if he should use the original style radius rod ball and socket or the replacement cast iron style with the rubber ball. Les Andrews does not recommend the replacement style with the rubber ball, even though it has been a popular, after market, item for decades. A Model A┬áradius rod ball is designed to maintain a castor angle, or front axle tilt of 5 degrees… To read more click here Radius Rod Ball and Socket