I found a steel tube in a scrap bin that just so happened to have an inside diameter that matched the outer diameter of some copper pipe used for feeding oil to boilers. The result is a much sleeker and sturdy pen that works so much better that the last. I used a plastic shim to fit the nib and cartridge in snugly. The clip was the most fun to make, I cut a copper pipe in half and flattened it into a sheet which I cut a strip out of, I then shaped it using a vice and a hammer. It is soldered to the cap. The end of the pen is a furniture tack glued in place.