I was at a guys place some years ago and he was makin ramrods with a homemade jig. It is a little difficult to describe. He had taken a couple pieces of oak 1x6 on edge and spaced them apart wide enough to clear his router bit. He had mounted his router on a flat piece on top such that it could be moved from size to size. In the side of the near piece, he had bored holes the size of the square of the wood he was using, and on the opposite side the size of the outgoing dowel. He put the pieces together and drilled the outgoing hole through both of them in the drill press, then drilled the larger ingoing hole while it was clamped down so that they were centered. He had about 4 different sizes drilled there so that he could make different sized ramrods. This was all mounted on a base on a table. The router bit just ran between the guides and he Xed the end of a piece of straight grained wood he had cut and put a screw in it and chucked it in a hand drill, and ran it though the jig. The big hole centered the piece, the router turned it to size, and the outie hole stabilized it on the other side. It was pretty neat. Considering he could have ordered a good straight hickory ramrod from the Log Cabin Shop for $2.50.
Bill