Joined: Apr 2006
Posts: 4,047
Likes: 937
From: Washington County, Vermont, USA
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
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.