That's the feller, the bottle Dynamo was crazy small/light too. Indeed, it's the velogical mentioned in that thread. http://www.velogical-engineering.com/rim-dynamo-en-1
The only problem with the velogical is that your wheel has to be bang-on true. Showstopper as far as I'm concerned.
Why is that? Surely it could be spring mounted, so that its always in contact with the wheel. Isnt that how bottle dynamos used to function.
@cgg started
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That's the feller, the bottle Dynamo was crazy small/light too. Indeed, it's the velogical mentioned in that thread. http://www.velogical-engineering.com/rim-dynamo-en-1