Senior Member
Join Date: Apr 2006
Location: Washington County, Vermont, USA
Posts: 3,782
Bikes: 1966 Dawes Double Blue, 1976 Raleigh Gran Sport, 1975 Raleigh Sprite 27, 1980 Univega Viva Sport, 1971 Gitane Tour de France, 1984 Lotus Classique, 1976 Motobecane Grand Record
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Given how much we are prepared to spend on bikes, I would absolutely take that frame to a machine shop and have them cut the appropriate chamfer, as opposed to having at it by eye with a file. There are places where it's appropriate to try to save a few bucks, but this does not appear to me to be one of them.