[lugerholsterrepair]

Wilhelm, I am sure you are correct! Especially one with front and rear fins. This type would slide along easily in a tube.
The Estes kits/rockets have a short section of soda straw glued top and bottom. This lets you slide the rocket onto a section of steel rod for a guidance system.
When I was a little kid we used to take Christmas wrapping tubes and a loader would light pop bottle rockets and shove them in. You could aim pretty good!
Training for my Military years!
Jerry Burney