Fellas,
I've had the same problems with getting my bushings off my blanks after CA, so I went on amazon and purchased some Delrin rod. I drilled the rod with 1/4 bit to slide on my mandrel. I then turned two cones out of the Delrin. So now I put a cone on each side, snug up my tail stock (not too much, cause you will expand your brass tube). Finally, I do my CA finish and the cones will slide right out when done. I just use a tiny amount of vasoline every once in a while on them to keep them slick. No problems anymore. Sounds like a lot, but check the library for making Delrin bushings to get a visual. Another trick is to do half your finish, flip your blank and do the other half. That way the beginning end doesn't get all the build up of CA. Hope this helps.
Dave