tried everything mentioned above
Tried every process mentioned above with mixed results. To present my most successful procedures are as follows. After i rough up the outside of the tubes i use a q tip to apply an electrical wire lubricant /auto wax to the inside 1/4 nch of booths ends of each tube and to my tapered tube holder( the device that looks like a burnishing tool) start one tube about 1/4 into the wood, apply glue push it into the wood in a rotating motion about 2/3 of the way, pull it out and repeat from opposite end. i always have the wood 1/4 inch longer that the tub so i can push the tube all the way to one end and then push it back to be equal lengths from each end of the wood. I lay the blank flat for the epoxy to dry. I wipe my insertion tool down immediately. Next day i saw a little less than one eight inch off both ends of the wood blank ( dont want the glue to gum my sandpaper on teh disk sander), flick out the glue residue if there is andy with a round file or mandral scre threads , use a jig on disk Sanders to sand end concentric with tubs ( careful not to take any brass, install on lathe , turn round then use a exact fit mandrel on the lathe to sand the wood to just rub brass tube, return to thel athe and finish turn the pen. I do not use acatone or other solvent to clean the inside of the tube. Interesting some one on the site sales a pen blank finish sander that appears to work well, but before i saw his i was using a reverse method by inserting exact size shafts in the head stock then sliding a a rubber grommet onto the first to friction drive the semi finished blank and have sandpaper attached to the tail stock which i move toward the headstock. This way i can back off the sand paper to see what i accomplished.