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Had one very similar for turning closed end pens there was a kit were the tube had a thread on one end which you screwed on the the mandrel when it was finished the nib end screwed in on the same thread and it worked
With a tap & die set you can make your own a piece of threaded rod and some tubing grip the rod in your chuck cut a thread in the rod cut it of glue it in your bit of wood screw it on the threaded rod a bit of support from the tailstock and turn away