Refer back to my post on Sat. about my guides. The drill bit was used to keep from mashing the guide while working on it. I made one at a time off the exposed end of the gas line. Brake line is much to small in diameter. I turned the finished guide upside down still on the drill bit and cut a slot length ways the length of the guide. Spread slightly and this gives you the flat bottom. A smaller diameter steel rod run between all the guides at the same time keep them lined up. After it cools you can still shape them a bit to suit. Dickey Greer West Monroe,La Dickey's Recreation Room