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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
yoshy
Pics and details of the bottom bracket dynamo please!