I will second the use of a good 2 part epoxy glue to always glue in tubes. This does 2 things. Gives a secure adhesion and also fill any gaps between tube and blank. Highly suggest this method. Added bonus it is more flexible and gives longer open times to insert tube. just need to plug the ends to keep epoxy from getting inside tube. but you should do this using any type adhesives. I like to use silly putty. cheap and easy to work with.
I only wipe the outside with acetone; don't do the inside. I now use Two Ton two part epoxy in twin four ounce bottles. Has long working time so I can do four or five pens at once. Plug one end with modeling clay...let the blank sit for a few hours and use a transfer punch to clear it. Note: i wipe the end of the tube with DNA as the clay leaves a residue on the tube.