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The late Roger Wheeler found a way of quietening the Miller alternator, which at very low speeds, even at kickstart operating speed, can sound like a broken crank ! He just put a nylon (?) sleeve on the crankpin screw drive spigot, and enlarged the slot in the drive disc to accommodate it. This stops the terrible clack-clack noise, as it stops the metal-to-metal contact.
I doubt that the MC45 dynamo produced anywhere near 70/80 watts. Perhaps 45 to 50 watts, on a good day with a following wind! Perhaps that is why they called it the MC45 …..?