Several years ago I bought a bunch of closeout stock from TOTW. among the items in the grab bag, was a bunch of flat pieces of forty thousandths brass, with ribbing rolled into them, on what appeared to be a small pressure roller. They were stock to make trader gun pipes. I decided, that if you could make trade gun pipes on a small pressure roller, you could make rifle pipes the same way. I made a roller from angle iron, and shafting, using grade eight flat washers to form the ribs. After discovering that some small teeth had to be cut into the roller in the bottom of the grooves to give it enough traction to roll the brass through, it worked just fine. I always examined old rifles, for evidence of the use of such a tool, and having not found one that shows the fine tooth pattern in the recesses of the ribs. I decided I liked the hand made look of individually made pipes better. I sold the roller to a fellow that started making ribbed cap boxes with it, and eventually wore it out.
Hungry Horse