10.4 and 12.4mm drill bits are required. Antique Japanese style cherry blossoms carving center band with antique silver plated. Germany made Schmidt 888 roller ball pen refill.
Note: Since both tubes are closed in one end, please spare the blank 3-5cm longer as to turn the end round. Mount only one bushing to mandrel and push the barrel end tight by the tailstock live center. To keep the barrels turning in center, make your own wooden bushing to fill the space between tubes and mandrel.
Use only one bushing for one barrel. Use 13mm bushing for the lower barrel.