Chuck;
The way I used to toe-in Mafac centerpulls was to take a round file the same
diameter as the pad holder post (a chainsaw file works well) and file a shallow groove across the alloy washer that sits between the post and the ar m. File it at a bit of an angle so that one side's deeper and you've got your toe-in. The groove also gives you a larger surface for the pad holder post to bed down in which would maybe make the brakes a bit more solid... I always thoug ht it made 'em squeal less but maybe that was my imagination.
Bob Hovey Columbus GA
Chuck writes:
As vintage brakes go MAFAC centerpull brakes are great stoppers and I have them on a bunch of my bikes, but there is no provision for adjusting the toe-in other than bending (never had one break when I bent them for toe-in, by the way). The MAFAC calipers are forged aluminum (early ones are actually stamped DURAL FORGE) so that probably makes them less prone to break when bending 'em, I'd guess.
Chuck Schmidt
South Pasadena, CA USA
http://www.velo-retro.com (reprints, t-shirts & timelines)