Thats kinda how i do mine after i fine tuned the dowel i then wrap paper around it and scotch tape it so its as big around as its going to need but then all smooth. I scotch tape it where i lick the glue.Crawdad: When I made paper cartridges for my Podewils-Lindner I used a piece of 1/2" copper tubing and fine tuned the diameter by wrapping with electrical tape. I used a thin craft glue (similar to rubber cement) to bond mine but I think mink oil would also have worked just fine. I am using copy paper which has been soaked in a potassium nitrate solution for mine.