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yoshy-
Google Sanyo Dynapower if you want a general view of the subject. There were similar objects from Soubitez (SJSC has NOS ones), Union and others. Don't get too excited though, he's looking to change to a hub dyno for a reason - the under-BB ones are hard to keep going through more than one winter, and sit nearer to bottle dynamos than to hub dynamos in terms of overall efficiency.
gbj_tester
Currently working on this - rides like a charm. Somehow, I'll swap wheels for a dyno hub and silver rims. (ATM It has a bottom bracket dynamo). I struggle to find a pair of 32h silver rims, something like dt460 but in chrome.... A lovely bike though, and apart hours of work it was a bargain !