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has anyone widened a brake bridge hole in an old steel frame to fit modern calipers?
It's the leading face that needs to be widened and unless your frame has a particularly strange geo, you won't get a drill inside the triangle.
Have a look on Sheldon Brown, he covers fitting modern brakes to an old frame: I think it's in the dual pivot brakes article.
Also sawing a seatpost out of another frame, fun. In other projects - has anyone widened a brake bridge hole in an old steel frame to fit modern calipers? Is that the simplest/best solution?