multimodal commuter
Join Date: Nov 2006
Location: NJ, NYC, LI
Posts: 19,808
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
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I believe all the 6v SA dynamo parts interchange from one hub to another. The 8v and 12v dynamos were bigger, but that's not your problem.
I just looked at a 1951 Dynohub and I don't see any way to disassemble the armature. It's easy to remove the magnet, and everything inside it, from the hub shell. That's the part that will interest you first. After that, it is easy to separate the magnet from the armature, if you want to do that (but all the instructions say don't do that without a keeper, which you probably don't have). It sounds like the problem with your hub is a loose connection between the armature and the terminals, and I don't know how to fix that.
so yes, to answer your question, I believe you can seamlessly switch the dynamo parts (magnet and armature) from another 6v hub, front or rear.