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Size of dynamo top-bracket fixing screw?


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The top bracket-bolt aperture is threaded on all my dynamos but not one takes a standard UNF or metric threaded bolt; not that I can find anyway. It’s the one that goes through the sliding belt adjuster that connects to the water pump housing. It’s a coarse thread and I can’t find any kind of match that won’t wring the threads - are these screws / bolts available from suppliers?

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