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Have you looked at used shimano dynamo hubs? Or even full wheels on ebay? If you keep your eye out I can well imagine you'd get a wheel for £50 or something. Eg this plus the train the Milton Keynes
I used to have a shimano dynohub, or possibly a nexus. I think it might have even started the thread. There is obviously more drag than with a SON/SP, but tbh it's perfectly acceptable and better than a bottle would be.
Anyone have any experience with bottle dynamos? Not Velogical, as the problem is my budget doesn’t stretch to SON/SP dynamos and they are essentially equivalent price-wise (£100-£200ish). It’s for my Record Ace so ideally just needs to work with 6V/3W lights and be somewhat serviceable and replaceable.