I use an automotive drum brake wheel cylinder hone (three stones, not two) purchased from the local NAPA store. I use an electric drill with a cord at slow speed, the slowest that will turn the hone. Need to keep at least 3/4 of the stone height in the tube at the top of the stroke. 30 seconds to one minute does it on a quality steel frame. A Flying Pigeon takes longer. Prevents imperfections from scratching up the seat post.
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