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Scilly.Suffolk-
I cut my steerer freehand and then didn't file the absolutely perfect flat top because I'm a fucking champ
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Freehand with a piece of paper wrapped around the steerer to act as a visual cutting guide, then file it to get it exactly flat and smooth, and put a small bevel on the outside. Never had any problems with fibre delamination.
PhilDAS
Brommers
Not unless you're a real heavy-handed muppet. I file the tops of carbon steerer tubes and they're fine. Just use a #2 rather than a bastard file.