For smallish tubing, miscegenation between a cylinder hone and a flap
Cut a piece of m/s rod of suitable diameter to a suitable length.
Tear off a strip of emery cloth of suitable grit and suitable width
(from a sheet) or a suitable length (from a roll). Tape one end of
the strip to one end of the rod with duct or Gorilla tape. Wrap the
strip around the rod, abrasive surface outward. (Yes, you have to wrap
in the right direction or use a reversible drill when you don't.) Put
the rod in your electric drill, insert the wrap into the tube and spin
it. If the flap becomes worn, tear off a bit and continue.
Variations on this, along with determination of "suitable", may do
what you want.
Or slit the rod lengthwise and put one edge of the abrasive in the
slit. this is probably a little more secure than tape, but a hell of a
lot more work. - leave it to someone from the right side of the
country to find the easier way!
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