I was looking at my carb cross-over tube and found the attach points on the Bing carbs are a little larger than the metal cross-over equalization tube. On each end of the metal cross-over tube is a short (2" approx) length of rubber hose which is clamped on the metal cross-over tube and to the carb attach points. This rubber hose has been really stretched to fit over the carb attach points, and I got to thinking, "Is there a reason the metal cross-over tube is smaller than the carb attach points, and does that cross-over tube really need to be metal?" So, does it need to be this way, or can I just get a rubber hose long enough to go from one carb to the other, deleting the metal tubing?