So I have an old Shwinn World Sport that I'm upgrading since I got it for free from a family friend. One of the upgrades I'm doing is putting on brifters instead of the lever shifters on it now. The lever shifters are attached to the head tube right now and never had down tube shifters. I've attached an image of where my shifting cable runs on the downtime and wondered that since these are here do I need to install cable stops on the down tube. Let me know what you think, Thanks!