B-b-b-b-b-b-bicicle Rider
Joined: Apr 2005
Posts: 749
Likes: 5
From: Racine WI
Bikes: 1997, stumpjumper S-works hardtail, Medici, Giant Perigee(track dropouts and fixed gear), Columbia twosome, schwinn twinn, '67 raleigh 5 speed internal hub, Old triumph 3 speed, old BSA 3-speed, schwinn Racer 2spd kickback, Broken raysport criteriu
Some of those reaming tools are light enough to just take out burrs and imperfections. If you only run it for a few seconds, it won't do damage and will just leave it smooth. there are often burrs around the slit in the seat tube where the clamp holds the post. If you run it down the seat post for minutes on end, you'll be taking out a considerable chunk of frame metal.
If you're seriously worried about reaming, then try to find a light wire brush that will fit your drill, one without the extra knobbies on the end of the wire.