I'm building a 57 station wagon. I've put a tubular front suspension on. As I was taking the old suspension apart I noticed that it had an extra "rod" and small coil spring (approx. 1 1/2 inch diameter and 2 inches tall) between the upper and lower ball joints. A friend suggested that it may have been some sort of sport suspension that pre-loads the ball joints. Does anyone know, what is this?