The Weinmann 500+ series are inexpensive but very good quality brakes. They adjust very easily so there is no play in the arms and both arms actuate in synch. Functionally as good as Campy of the same period.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1