I remember helping my dad change the brushes on many of the dynamos on his old, junk cars. When I started my apprenticeship in the late '70's, they were, more or less, a thing of the past. My first 2A had a dynamo, but I converted to alternator as I fitted an electric winch to it. Currently in the process of reviving a '67 2A, which also has a dynamo, which has had a 'refresh'. It remains to be seen whether the regulator is operational, I'll cross that bridge when I get there.